1 Department of Medicine and Surgery, University of Salerno, Salerno, Italy.
2 Department of Gastroenterology, Kings College London, London, UK; The Rayne Institute, St Thomas Hospital, London, UK.
3 Academic Department of Neurosciences, Royal Hallamshire Hospital, Sheffield, UK.
4 School of Medicine, University of Tampere, Tampere, Finland; Department of Internal Medicine, Tampere University Hospital, Tampere, Finland; Department of Internal Medicine, Seinäjoki Central Hospital, Seinäjoki, Finland.
5 Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; Department of Pediatrics, Örebro University Hospital, Orebro, Sweden.
6 Coeliac UK, High Wycombe, UK.
7 Gastroenterology and Liver Unit, Royal Hallamshire Hospital, Sheffield, UK.
8 Cambridge Intestinal Unit, Addenbrooke's Hospital, Cambridge, UK.
9 Department of Dermatology, St Mary's Hospital, London, UK.
10 Department of Gastroenterology, University Hospital Llandough, Cardiff, UK.