1. Department of Surgery, South Älvsborg Hospital, Borås, Sweden.
2. Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden.
3. Hospital Universitario Vall d'Hebron, Wider-Barcelona, Barcelona, Spain.
4. Vall d'Hebron Institut de Recerca, VHIR, Universitat Autònoma de Barcelona, Barcelona, Spain.