APA (7th ed.) Citation

Büchler, M. W., Martignoni, M. E., Friess, H., & Malfertheiner, P. (2009). A proposal for a new clinical classification of chronic pancreatitis: Correspondence. BMC gastroenterology, 9, .

Chicago Style (17th ed.) Citation

Büchler, Markus W., Marc E. Martignoni, Helmut Friess, and Peter Malfertheiner. "A Proposal for a New Clinical Classification of Chronic Pancreatitis: Correspondence." BMC Gastroenterology 9 (2009).

MLA (9th ed.) Citation

Büchler, Markus W., et al. "A Proposal for a New Clinical Classification of Chronic Pancreatitis: Correspondence." BMC Gastroenterology, vol. 9, 2009.

Warning: These citations may not always be 100% accurate.