Vinjar Fønnebø , Sameline Grimsgaard , Harald Walach* , Cheryl Ritenbaugh* , Arne Johan Norheim* , Hugh MacPherson* , George Lewith* , Laila Launsø* , Mary Koithan* , Torkel Falkenberg* , Heather Boon* and Mikel Aickin*
BMC Medical Research Methodology 2007, 7:7doi:10.1186/1471-2288-7-7