Authors: Suetonia C Palmer; Giorgia de Berardis; Jonathan C Craig; Allison Tong; Marcello Tonelli; Fabio Pellegrini; Marinella Ruospo; Jörgen Hegbrant; Charlotta Wollheim; Eduardo Celia; Ruben Gelfman; Juan Nin Ferrari; Marietta Törok; Marco Murgo; Miguel Leal; Anna Bednarek-Skublewska; Jan Dulawa; Giovanni F M Strippoli Journal: BMJ Open Date: 2014-05-19 Impact factor: 2.692