1. From University Medical Center Utrecht and Diakonessenhuis Utrecht, Utrecht; University of Twente, Enschede; Medical Center The Hague, The Hague; Vu University Medical Center, Amsterdam; Amstelland Hospital, Amstelveen; Catharina Hospital, Eindhoven; St. Antonius Hospital, Nieuwegein; Zuyderland Hospital, Heerlen; Gelderse Vallei Hospital, Ede; Tergooi Hospital, Hilversum; Groene Hart Hospital, Gouda; Meander Medical Center, Amersfoort; Radboud University Medical Center, Nijmegen;
2. Maastricht University Medical Center, Maastricht; Gelre Hospital, Apeldoorn; and Zuwe Hofpoort Hospital, Woerden, the Netherlands.