1. UK Cochrane Centre; Summertown Pavilion 18 - 24 Middle Way Oxford UK OX2 7LG
2. Bond University; Centre for Research in Evidence-Based Practice (CREBP), Faculty of Health Sciences and Medicine; Gold Coast Queensland Australia 4229
3. University Medical Center Utrecht; Department of Otorhinolaryngology & Julius Center for Health Sciences and Primary Care; Heidelberglaan 100 Utrecht Netherlands 3508 GA