https://www.patreon.com/posts/peptic-ulcer-106479831
(mild) peptic ulcer, CHP, HK
(moderate) Sverdén, Emma, et al. "Peptic ulcer disease." Bmj 367 (2019)
(severe) Islam, Md Mohaimenul, et al. "Adverse outcomes of long-term use of proton pump inhibitors: a systematic review and meta-analysis." European journal of gastroenterology & hepatology 30.12 (2018): 1395-1405.
