Authors: Joerg J Meerpohl; Lisa K Schell; Dirk Bassler; Silvano Gallus; Jos Kleijnen; Michael Kulig; Carlo La Vecchia; Ana Marušić; Philippe Ravaud; Andreas Reis; Christine Schmucker; Daniel Strech; Gerard Urrútia; Elizabeth Wager; Gerd Antes Journal: BMJ Open Date: 2015-05-05 Impact factor: 2.692