Botulinum toxin versus pneumatic dilatation in the treatment of achalasia: a randomised trial
M F Vaezi, J E Richter, C M Wilcox, P L Schroeder, S Birgisson, R L Slaughter, R E Koehler, M E Baker
Gut Feb 1999, 44 (2) 231-239; DOI: 10.1136/gut.44.2.231
