1. Division of Paediatric Nephrology; Department of Paediatrics; University Hospital; Lausanne Switzerland
2. Division of Biostatistics; Institute of Social and Preventive Medicine; University Hospital of Lausanne; Lausanne Switzerland
3. Division of Paediatric Nephrology; Department of Paediatrics; University Hospital; Geneva Switzerland
4. Department of Psychology, Health Psychology; University of Lausanne; Lausanne Switzerland