Source: US FDA,
Date published: 30/04/2012

Source: Cochrane Library,
Date published: 27/04/2012

Source: BioSpace,
Date published: 27/03/2012

Source: Medical Letter on Drugs and Therapeutics,
Date published: 23/02/2012

Source: BBC Health News, South Central Priorities Committee,
Date published: 08/12/2011

Source: Medical Letter on Drugs and Therapeutics,
Date published: 05/12/2011

Source: Regional Drug and Therapeutics Centre,
Date published: 10/11/2011
Review date: 30/09/2013

Source: Scottish Medicines Consortium (SMC),
Date published: 11/10/2011

Source: FDA,
Date published: 07/10/2011

Source: Arch Internal Med,
Date published: 16/09/2011