1. University Medical Center Utrecht; Department of Otorhinolaryngology & Julius Center for Health Sciences and Primary Care; Heidelberglaan 100 Utrecht Netherlands 3508 GA
2. Bond University; Centre for Research in Evidence-Based Practice (CREBP); University Drive Robina Gold Coast Queensland Australia 4229
3. Radboud University Nijmegen Medical Centre; Department of Operating Rooms; Hp 630, route 631 PO Box 9101 Nijmegen Netherlands 6500 HB