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aGastroenterology Department, Coimbra University Hospital, Coimbra, Portugal
bOtorrinolaryngology Department, Coimbra University Hospital, Coimbra, Portugal
Corresponding author. Serviço de Gastrenterologia, Hospitais da Universidade de Coimbra, Praceta Professor Mota Pinto, 3000-075 Coimbra, Portugal. Tel./fax: +351 239701517.