| from 06/01/2003 to present in ProQuest Research Library |
| from 03/07/2001 to present in LexisNexis Academic |
| from 09/18/1997 to present in LexisNexis Academic |
| from 06/01/2000 to present in Academic OneFile and General OneFile |
| from 03/01/2005 to present in Academic OneFile |
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| from 01/31/2004 to present in LexisNexis Academic |
| from 01/05/2006 to present in LexisNexis Academic |
| from 07/01/1999 to present in Academic OneFile |
| from 03/14/2005 to 03/14/2005 in LexisNexis Academic |
| from 01/18/2005 to present in LexisNexis Academic (selected full-text only) |
| from 07/26/2000 to present in LexisNexis Academic |
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| from 03/01/1976 to 04/19/2007 in LexisNexis Academic |
| from 01/02/1989 to 04/28/2000 in General OneFile |
| from 06/09/1997 to present in LexisNexis Academic (selected full-text only) |
| from 08/31/1997 to present in Newspaper Source |
| from 01/17/1996 to present in LexisNexis Academic |
| from 11/01/1895 to present in LexisNexis Academic |
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| from 05/19/1995 to 05/07/2008 in LexisNexis Academic |
| from 08/28/2000 to present in LexisNexis Academic |
| from 01/01/1991 to 09/30/1993 in Academic Search Premier, Literary Reference Center and MasterFILE Premier |
| from 07/16/1998 to present in LexisNexis Academic |
| from 01/01/1991 to present in LexisNexis Academic (selected full-text only) |
| from 11/01/1858 to 02/28/2008 in LexisNexis Academic |
| from 03/08/2000 to present in LexisNexis Academic |
| from 08/01/2007 to 11/06/2007 in LexisNexis Academic |
| from 11/01/1993 to present in LexisNexis Academic |
| from 01/01/1995 to 10/01/1998 in LexisNexis Academic |
| from 01/01/2005 to 3 years ago in ProQuest Research Library |
| from 08/01/2007 to present in ScienceDirect Health & Life Sciences College Edition |
| from 01/01/2005 to present in Academic OneFile |
| from 02/06/2002 to present in LexisNexis Academic |
| from 09/23/2005 to present in LexisNexis Academic |
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| from 06/01/2005 to present in LexisNexis Academic |
| from 06/06/2005 to present in LexisNexis Academic |
| from 05/05/2008 to present in LexisNexis Academic |
| from 02/13/1990 to 04/30/1992 in LexisNexis Academic (selected full-text only) |
| from 10/01/2005 to present in Literary Reference Center |
| from 05/01/2008 to present in Literary Reference Center |
| from 02/01/2004 to 10/01/2007 in Academic OneFile and General OneFile |
| from 06/14/2007 to present in LexisNexis Academic |
| from 04/14/1998 to present in LexisNexis Academic (selected full-text only) |
| from 07/14/2003 to present in LexisNexis Academic |
| from 11/04/2003 to present in Newspaper Source |
| from 12/01/2002 to 1 year ago in ABI/INFORM Global and ProQuest Research Library |
| from 01/01/2004 to 2 months ago in Academic OneFile and General OneFile |
| from 01/01/2004 to 3 months ago in Academic Search Premier |
| from 01/10/2002 to 05/29/2003 in LexisNexis Academic |
| from 09/19/2008 to present in LexisNexis Academic |
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| from 01/01/1980 to 02/05/2007 in LexisNexis Academic |
| from 01/01/1991 to 12/31/1991 in LexisNexis Academic (selected full-text only) |
| from 12/07/2000 to present in LexisNexis Academic |
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| from 09/01/1993 to present in LexisNexis Academic |
| from 01/23/2002 to present in LexisNexis Academic (selected full-text only) |
| from 11/01/2003 to 11/30/2003 in Business Source Premier |
| from 09/03/1997 to present in LexisNexis Academic |
| from 06/19/1983 to present in LexisNexis Academic |
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| from 01/01/1984 to present in MasterFILE Premier |
| from 01/01/1991 to present in ProQuest Research Library |
| from 06/01/2001 to present in Literature Resource Center |
| from 06/22/2001 to present in Academic OneFile and General OneFile |
| from 12/01/2003 to present in LexisNexis Academic |
| from 01/01/2004 to present in Academic Search Premier |
| from 10/01/2006 to present in Academic OneFile |
| from 07/01/1998 to present in ProQuest Research Library |
| from 11/01/2002 to present in General OneFile |
| from 01/01/2003 to 03/31/2003 in MasterFILE Premier and Middle Search Plus |
| from 02/06/2003 to 07/24/2008 in LexisNexis Academic |
| from 01/01/1992 to 09/23/1993 in LexisNexis Academic (selected full-text only) |
| from 01/06/1998 to 01/30/2003 in LexisNexis Academic (selected full-text only) |
| from 07/20/2008 to present in Newspaper Source |
| from 05/04/2008 to present in LexisNexis Academic |
| from 06/01/2004 to 09/30/2005 in MasterFILE Premier |
| from 05/03/2007 to present in LexisNexis Academic |
| from 01/01/1998 to 1 year ago in Academic Search Premier and Health Source: Nursing/Academic Edition |
| from 03/01/2000 to 06/30/2000 in Academic Search Premier |
| from 01/01/1998 to 1 year ago in Academic Search Premier |
| from 02/02/1998 to 1 year ago in Academic Search Premier |
| from 09/01/2001 to present in Health Source: Consumer Edition |
| from 03/01/2000 to 06/01/2001 in General OneFile |
| from 06/28/2000 to 06/25/2001 in LexisNexis Academic |
| from 02/01/2009 to present in Primary Search |
| from 07/01/2002 to present in MasterFILE Premier |
| from 01/01/2005 to present in General OneFile |
| from 06/01/2005 to present in LexisNexis Academic |
| from 03/01/2001 to 03/31/2007 in MasterFILE Premier and Primary Search |
| from 02/16/1998 to 12/18/2000 in LexisNexis Academic |
| from 10/01/1998 to 01/01/2000 in ProQuest Research Library |
| from 01/01/1996 to present in LexisNexis Academic |
| from 01/01/2004 to present in ABI/INFORM Global |
| from 01/01/2006 to present in General OneFile |
| from 02/10/2009 to present in Newspaper Source |
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| from 03/06/1992 to present in LexisNexis Academic |
| from 09/22/1996 to 12/22/2005 in General OneFile |
| from 12/01/2003 to present in Academic Search Premier |
| from 01/01/2006 to present in Academic OneFile |
| from 01/01/2006 to present in ScienceDirect Health & Life Sciences College Edition |
| from 2002 to 2007 in PubMed Central |
| from 12/01/2006 to 08/17/2007 in Academic OneFile |
| from 06/06/2001 to 06/06/2001 in LexisNexis Academic |
| from 01/01/1999 to present in Academic OneFile and General OneFile |
| from 05/25/2007 to present in LexisNexis Academic |
| from 01/05/2006 to present in LexisNexis Academic |
| from 03/01/2007 to present in Literary Reference Center |
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| from 01/05/1996 to 09/12/2008 in Academic OneFile and General OneFile |
| from 02/28/2000 to 07/01/2008 in General OneFile |
| from 01/10/1996 to present in LexisNexis Academic |
| from 01/10/1996 to 09/10/2008 in Academic OneFile and General OneFile |
| from 01/10/1996 to 06/25/2008 in ABI/INFORM Global |
| from 06/03/2005 to 01/20/2006 in ABI/INFORM Global and General OneFile |
| from 01/31/1997 to 09/19/2008 in General OneFile |
| from 01/31/1997 to 06/27/2008 in ABI/INFORM Global |
| from 12/29/1999 to present in LexisNexis Academic |
| from 12/29/1999 to 06/27/2008 in ProQuest Research Library |
| from 01/01/1996 to present in LexisNexis Academic |
| from 01/01/1996 to 09/19/2008 in Academic OneFile and General OneFile |
| from 01/01/1996 to 06/27/2008 in ProQuest Research Library |
| from 01/31/1997 to 12/22/1999 in LexisNexis Academic and ProQuest Research Library |
| from 12/29/2003 to 07/01/2008 in ABI/INFORM Global |
| from 03/22/2003 to 03/22/2007 in Academic OneFile and General OneFile |
| from 01/01/1991 to present in LexisNexis Academic |
| from 07/01/1991 to 09/01/2008 in Academic OneFile and General OneFile |
| from 01/01/1992 to 02/01/2008 in ABI/INFORM Global and ProQuest Research Library |
| from 01/01/2000 to present in Academic Search Premier, Business Source Premier, MAS Online and MasterFILE Premier |
| from 07/01/1991 to 12/31/1999 in Academic Search Premier, Business Source Premier, MAS Online and MasterFILE Premier |
| from 07/01/1991 to 12/01/1991 in ABI/INFORM Global |
| from 04/01/2004 to 04/01/2008 in ABI/INFORM Global |
| from 01/01/1999 to 01/01/2000 in General OneFile |
| from 10/01/2004 to 10/01/2008 in ABI/INFORM Global |
| from 01/04/2002 to 06/10/2005 in General OneFile |
| from 09/22/2002 to 09/22/2007 in Academic OneFile and General OneFile |
| from 01/01/1996 to present in LexisNexis Academic |
| from 01/01/1996 to 09/01/2008 in Academic OneFile and General OneFile |
| from 01/01/2003 to 01/01/2005 in ABI/INFORM Global |
| from 02/13/2006 to 09/19/2008 in General OneFile |
| from 01/01/2003 to 01/01/2003 in Academic OneFile and General OneFile |
| from 01/01/2003 to present in Business Source Premier |
| from 09/01/2000 to present in Business Source Premier |
| from 02/12/2009 to present in LexisNexis Academic |
| from 04/15/1991 to present in LexisNexis Academic |
| from 07/15/2001 to present in Academic OneFile and General OneFile |
| from 08/01/2001 to present in Literature Resource Center |
| from 12/01/2001 to present in Academic Search Premier, Literary Reference Center and MasterFILE Premier |
| from 07/01/2001 to present in General OneFile |
| from 04/01/2002 to present in Business Source Premier and MasterFILE Premier |
| from 07/01/2003 to present in LexisNexis Academic |
| from 01/01/2004 to present in LexisNexis Academic |
| from 12/01/2004 to present in General OneFile |
| from 01/01/2004 to present in Business Source Premier |
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| from 01/01/2004 to present in Business Source Premier |
| from 10/01/1990 to present in LexisNexis Academic |
| from 07/01/1999 to 06/01/2000 in General OneFile |
| from 09/09/2002 to 09/09/2002 in LexisNexis Academic |
| from 06/07/2001 to 06/07/2001 in LexisNexis Academic |
| from 11/01/2007 to present in MasterFILE Premier |
| from 01/01/2002 to 11/30/2008 in Literature Resource Center |
| from 01/01/2002 to 11/01/2008 in Academic OneFile and General OneFile |
| from 03/01/2008 to present in Literary Reference Center |
| from 01/01/1991 to present in LexisNexis Academic |
| from 01/01/2005 to 11/01/2008 in ABI/INFORM Global |
| from 03/01/2002 to present in Academic OneFile and General OneFile |
| from 01/01/2004 to present in Academic Search Premier and Business Source Premier |
| from 02/01/2004 to present in ABI/INFORM Global |
| from 01/01/1995 to present in ScienceDirect Health & Life Sciences College Edition |
| from 10/01/2002 to 10/31/2004 in MasterFILE Premier |
| from 10/13/1996 to 10/13/1996 in LexisNexis Academic (selected full-text only) |
| from 10/17/1996 to present in LexisNexis Academic (selected full-text only) |
| from 02/27/1997 to present in Newspaper Source |
| from 03/24/2000 to 09/23/2009 in General OneFile |
| from 10/13/1996 to present in LexisNexis Academic (selected full-text only) |
| from 12/01/1998 to 01/31/2001 in Business Source Premier |
| from 09/01/2003 to present in LexisNexis Academic |
| from 03/06/1992 to present in LexisNexis Academic |
| from 01/01/1998 to 04/18/2008 in ProQuest Research Library |
| from 09/07/2001 to 04/18/2008 in Academic OneFile and General OneFile |
| from 09/06/2002 to 04/18/2008 in MasterFILE Premier, Middle Search Plus and Primary Search |
| from 12/13/2002 to 04/18/2008 in Professional Development Collection |
| from 01/01/2002 to 1 year ago in ABI/INFORM Global |
| from 03/01/1991 to 12/31/1998 in Academic Search Premier, MasterFILE Premier and Professional Development Collection |
| from 03/01/1999 to 07/01/2005 in ABI/INFORM Global |
| from 01/01/1995 to present in ScienceDirect Physical Sciences College Edition |
| from 03/01/2001 to 1 year ago in ABI/INFORM Global |
| from 03/01/1990 to 12/31/1990 in Academic Search Premier, MasterFILE Premier and Professional Development Collection |
| from 09/01/2000 to 12/31/2002 in Business Source Premier |
| from 07/01/2003 to 1 year ago in ABI/INFORM Global |
| from 09/01/2003 to present in Academic Search Premier and Professional Development Collection |
| from 05/01/2007 to 14 days ago in Academic OneFile |
| from 03/01/1998 to 6 months ago in Academic Search Premier, MasterFILE Premier and Professional Development Collection |
| from 01/01/2000 to 06/22/2000 in Academic OneFile and General OneFile |
| from 08/15/2000 to present in Newspaper Source |
| from 09/20/2000 to present in LexisNexis Academic (selected full-text only) |
| from 07/29/2007 to present in LexisNexis Academic |
| from 06/13/2006 to present in LexisNexis Academic (selected full-text only) |
| from 06/01/2006 to 12/30/2007 in Newspaper Source |
| from 03/01/1999 to present in Literature Resource Center |
| from 03/22/1999 to present in Academic OneFile and General OneFile |
| from 03/01/2007 to present in Literary Reference Center |
| from 04/30/1990 to present in LexisNexis Academic |
| from 03/15/1990 to 08/15/1990 in LexisNexis Academic (selected full-text only) |
| from 07/18/1990 to 07/18/1990 in LexisNexis Academic (selected full-text only) |
| from 04/08/1990 to 05/25/1990 in LexisNexis Academic (selected full-text only) |
| in ScienceDirect Health & Life Sciences College Edition |
| from 02/08/1990 to present in LexisNexis Academic (selected full-text only) |
| from 05/09/1990 to 05/10/1991 in LexisNexis Academic (selected full-text only) |
| from 06/15/1990 to 06/14/1991 in LexisNexis Academic (selected full-text only) |
| from 04/20/1990 to 10/03/1990 in LexisNexis Academic (selected full-text only) |
| from 01/19/1990 to present in LexisNexis Academic (selected full-text only) |
| from 02/09/1990 to 07/13/1991 in LexisNexis Academic (selected full-text only) |
| from 01/24/2002 to 06/27/2008 in LexisNexis Academic |
| in LexisNexis Academic (selected full-text only) |
| from 05/29/1998 to present in LexisNexis Academic |
| in LexisNexis Academic (selected full-text only) |
| from 12/28/1998 to 11/06/2000 in LexisNexis Academic (selected full-text only) |
| from 08/01/1998 to present in LexisNexis Academic |
| from 06/16/1998 to present in LexisNexis Academic |
| from 11/01/1997 to 12/15/2001 in LexisNexis Academic (selected full-text only) |
| from 02/19/2003 to present in LexisNexis Academic |
| from 07/23/1997 to present in LexisNexis Academic |
| from 09/11/2001 to present in LexisNexis Academic |
| from 2007 to present in PubMed Central |
| from 2007 to 1 month ago in PubMed Central |
| from 1998 to present in PubMed Central |
| from 2009 to present in PubMed Central |
| from 2000 to present in PubMed Central |
| from 01/01/1999 to 1 year ago in Academic OneFile, General OneFile and Literature Resource Center |
| from 01/01/2000 to present in Academic Search Premier and Literary Reference Center |
| from 03/07/2001 to present in LexisNexis Academic |
| from 10/19/1991 to 12/06/1991 in LexisNexis Academic (selected full-text only) |
| from 03/15/2007 to present in ScienceDirect Health & Life Sciences College Edition |
| from 01/01/2007 to present in LexisNexis Academic |
| from 02/10/1990 to present in LexisNexis Academic (selected full-text only) |
| from 01/01/2008 to present in LexisNexis Academic |
| from 10/18/2002 to 12/05/2002 in LexisNexis Academic |
| from 03/22/2006 to present in Academic OneFile |
| from 07/19/1991 to 07/19/1991 in LexisNexis Academic (selected full-text only) |
| from 06/01/2001 to 1 year ago in Academic Search Premier |
| from 04/24/2000 to present in LexisNexis Academic |
| from 12/01/2007 to present in Academic OneFile |
| from 12/08/2003 to 08/10/2007 in LexisNexis Academic |
| from 02/10/1990 to 10/15/1994 in LexisNexis Academic (selected full-text only) |
| from 10/15/1990 to 08/21/1998 in LexisNexis Academic (selected full-text only) |
| from 03/01/2008 to present in LexisNexis Academic |
| from 01/01/1999 to present in Academic OneFile and General OneFile |
| from 10/01/1998 to present in Business Source Premier |
| from 01/01/2003 to present in Business Source Premier |
| from 09/01/2000 to present in Business Source Premier |
| from 02/24/1998 to present in LexisNexis Academic (selected full-text only) |
| from 01/01/2006 to present in Newspaper Source |
| from 01/01/1995 to 1 year ago in ProQuest Research Library |
| from 08/18/1998 to 12/12/2002 in LexisNexis Academic (selected full-text only) |
| from 03/01/1974 to present in Academic Search Premier and Business Source Premier |
| from 04/15/2003 to present in Newspaper Source |