Development of consensus guidelines for the histologic recognition of microscopic esophagitis in patients with gastroesophageal reflux disease: the Esohisto project - Fiocca, R; Mastracci, L; Riddell, R; Takubo, K; Vieth, M; Yerian, L; Sharma, P; Fernström, P; Ruth, M (Hum Pathol, 2010)