authors Guyatt, Gordon Oxman, AD Sultan, S Glasziou, P Akl, Elie Alonso-Coello, P Atkins, D Kunz, R Brozek, Jan Montori, V Jaeschke, Roman Rind, D Dahm, P Meerpohl, J Vist, G Berliner, E Norris, S Falck-Ytter, Y Murad, MH Schunemann, Holger