2Boeckxstaens GE.Achalasia.Best Pract Res Clin Gastroenterol,2007,21:595-608.
3Pohl D,Tutuian R.Achalasia:an overview of diagnosis and treatment.J Gastrointestin Liver Dis,2007,16:297-303.
4Leyden J E,Moss AC,MacMathuna P.Endoscopic pneumatic dilation versus botulinum toxin injection in the management of primary achalasia.Cochrane Database Syst Rev,2006,(4):CD005046.