Authors: Massimo Brunetti; Ian Shemilt; Silvia Pregno; Luke Vale; Andrew D Oxman; Joanne Lord; Jane Sisk; Francis Ruiz; Suzanne Hill; Gordon H Guyatt; Roman Jaeschke; Mark Helfand; Robin Harbour; Marina Davoli; Laura Amato; Alessandro Liberati; Holger J Schünemann Journal: J Clin Epidemiol Date: 2012-08-03 Impact factor: 6.437