Proton pump inhibitors and risk of Clostridium difficile infection: a multi-country study using sequence symmetry analysis

Elizabeth E. Roughead, Esther W. Chan, Nam Kyong Choi, Jenna Griffiths, Xue Mei Jin, Joongyub Lee, Michio Kimura, Tomomi Kimura, Kiyoshi Kubota, Edward Chia Cheng Lai, Kenneth K.C. Man, Tuan Anh Nguyen, Nobuhiro Ooba, Byung Joo Park, Tsugumichi Sato, Ju Young Shin, Tong Tong Wang, Ian C.K. Wong, Yea Huei Kao Yang, Nicole L. Pratt