1. Evaluation of dysphagia: a careful history is crucial;Castell;Dysphagia,1987
2. Practical approach to the diagnosis and treatment of esophageal dysphagia;Richter;Compr Ther,1998
3. Heartburn, dysphagia, odynophagia, and other esophageal symptoms;Richter,1993
4. AGA technical review on management of oropharyngeal dysphagia;Cook;Gastroenterology,1999
5. Prevalence of swallowing complaints and clinical findings among 50–70 year old men and women in an urban population;Lindgren;Dysphagia,1991