1 Nordic Cochrane Centre, Rigshospitalet, 2100 Copenhagen Ø, Denmark; Institute of Medicine and Surgery, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark. Electronic address: al@cochrane.dk.
2 Nordic Cochrane Centre, Rigshospitalet, 2100 Copenhagen Ø, Denmark.
3 Nordic Cochrane Centre, Rigshospitalet, 2100 Copenhagen Ø, Denmark; Institute of Medicine and Surgery, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.