Authors: Robert Welte; Caroline L Trotter; W John Edmunds; Maarten J Postma; Philippe Beutels Journal: Pharmacoeconomics Date: 2005 Impact factor: 4.981
Authors: Catherine R H Aicken; Nigel T Armstrong; Jackie A Cassell; Neil Macdonald; Angela C Bailey; Sandra A Johnson; Catherine H Mercer Journal: BMC Health Serv Res Date: 2012-07-17 Impact factor: 2.655