1. Lausanne University Hospital; Cochrane Switzerland, Institute of Social and Preventive Medicine; Lausanne Switzerland CH-1005
2. Lausanne University Hospital; Institute of Social and Preventive Medicine; Biopôle 2 Route de la Corniche 10 Lausanne Switzerland 1010
3. Georges Pompidou European Hospital; Department of Public Health and Medical Informatics; 20 rue Leblanc Paris France 75015