Study recruitment flowchart. Of the 20,773 subjects who attended this study, we excluded 909 subjects as follows: two subjects less than 20 years old, five subjects who use both PPI (proton pump inhibitor) and H2RA (histamine H2-receptor antagonists), or 902 subjects with insufficient data for analysis (incomplete answers to the questionnaires and/or FSSG, loss of critical data such as age and sex, and so on). The eligible study population of 19,864 subjects was analyzed. In addition, 371 PPI users and 539 H2RA users among them were also analyzed.
Yamamichi et al. BMC Medicine 2012 10:45 doi:10.1186/1741-7015-10-45