authors Guyatt, Gordon Oxman, AD Kunz, R Woodcock, J Brozek, Jan Helfand, M Alonso-Coello, P Glasziou, P Jaeschke, Roman Akl, Elie Norris, S Vist, G Dahm, P Shukla, VK Higgins, J Falck-Ytter, Y Schunemann, Holger