scientific article published on 4 February 2005

scientific article

scientific article published on 01 November 1995

scientific article published in March 1986

scientific article

scientific article published on March 1, 2003

scientific article published in July 2006

scientific article published in April 2008

scientific article published in January 2002

scientific article published in The Lancet

scientific article published on January 1996

scientific article published on January 1996

scientific article published on 01 January 1991

scientific article published in February 1993

scientific article published on 01 January 1995

scientific article published on 7 September 2008

scientific article published in March 1990

scientific article published on 02 April 2009

scientific article published in May 2000

scientific article published on June 1, 1992

scientific article published on September 26, 1997

scientific article (publication date: 1999)

scientific article

scientific article published in February 1995

scientific article

scientific article published on 01 July 2001

scientific article published in February 1993

scientific article

scientific article published in May 2003

scientific article

scientific article

scientific article published on 07 June 2011

scientific article published on January 1995

scientific article published in September 2010

scientific article published in December 1988

scientific article published on May 1990