Stockholm county council, Stockholm, Sweden
Helena Kopp Kallner, Taby, Sweden
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
Danderyds Hospital, Stockholm, Sweden
Enköping Lasarett, Enköping, Sweden
Frölunda Hospital, Gothenburg, Sweden
Department of Surgery, Karloskoga Hospital, Karlskoga, Sweden
Department of Hand Surgery Södersjukhuset, Stockholm, Sweden
Karolinska Institutet, Stockholm, Sweden
Danderyd Hospital, Stockholm, Sweden
Karolinska Institutet, Stockholm, Sweden
HEMS Dalarna, Mora, Dalarna, Sweden
HEMS VGR, Gothenburg, VästraGötaland, Sweden