8Nebel O T, Fornes M F, Castell D O. Symptomatic gastroesophageal reflux: incidence and precipitating factors [J]. Am J Dig Dis, 1976,21 ( 11 ) :953-956.
9Klauser A G, Schindlbeck N E, Muller-Lissner S A. Symptoms in gastroesophageal reflux disease [J]. Lancet, 1990,335 (8683): 205-208.
10Locke G R, 3rd, Talley N J, Fett S L, et al. Prevalence and clinical spectrum of gastroesophageal reflux: a population-based study in Olmsted County [J]. Gastroenterology, 1997,112(5): 1448-1456.