Source: Cochrane,
Date published: 01/02/2012

Source: eMC (electronic Medicines Compendium),
Date published: 10/05/2011

Source: BMJ,
Date published: 03/06/2010

Source: Pharmaceutical Journal,
Date published: 26/07/2009

Source: MHRA,
Date published: 04/06/2009

Source: Drug Safety Update,
Date published: 05/05/2009

Source: MHRA,
Date published: 23/04/2009

Source: BMS Pharmaceuticals Ltd ,
Date published: 05/03/2009

Source: DARE,
Date published: 22/09/2008

Source: DARE,
Date published: 19/05/2008