1. Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland (B.S., C.M., H.F., G.W., A.R.)
2. Geneva University Hospital, University of Geneva, Geneva, Switzerland (A.C.)
3. University Hospital of Lausanne, University of Lausanne, Lausanne, Switzerland (M.C.)
4. University Hospital Zurich, University of Zurich, Zurich, Switzerland (H.F.G., B.L.)
5. University Hospital Basel, University of Basel, Basel, Switzerland (M.S.)
6. Regional Hospital of Lugano, University of Geneva, and University of Southern Switzerland, Lugano, Switzerland (E.B.)
7. Cantonal Hospital of St. Gallen, St. Gallen, Switzerland (P.S.)
8. Kantonsspital Baselland, University of Basel, Basel, Switzerland (P.E.T.).