Authors: Christian Ohmann; Rita Banzi; Steve Canham; Serena Battaglia; Mihaela Matei; Christopher Ariyo; Lauren Becnel; Barbara Bierer; Sarion Bowers; Luca Clivio; Monica Dias; Christiane Druml; Hélène Faure; Martin Fenner; Jose Galvez; Davina Ghersi; Christian Gluud; Trish Groves; Paul Houston; Ghassan Karam; Dipak Kalra; Rachel L Knowles; Karmela Krleža-Jerić; Christine Kubiak; Wolfgang Kuchinke; Rebecca Kush; Ari Lukkarinen; Pedro Silverio Marques; Andrew Newbigging; Jennifer O'Callaghan; Philippe Ravaud; Irene Schlünder; Daniel Shanahan; Helmut Sitter; Dylan Spalding; Catrin Tudur-Smith; Peter van Reusel; Evert-Ben van Veen; Gerben Rienk Visser; Julia Wilson; Jacques Demotes-Mainard Journal: BMJ Open Date: 2017-12-14 Impact factor: 2.692