1. Dysphagia caused by benign disorders of the distal oesophagus;American gastroenterological Association Guideline;Gastroenterol,1999
2. Dysphagia;Christein,2008
3. Dysphagie;Hirano,2013
4. Investigation and management of chronic dysphagia;Leslie;Brit Med J,2003
5. Dysphagia: evaluation and treatment;Lind;Gastoenterol Clin North Am,2003