Problem
Chen S, Underwood BR, Jones PB, Lewis JR, Cardinal RN. 2022. Association between lithium use and the incidence of dementia and its subtypes: a retrospective cohort study. PLOS Medicine. 19(3): e1003941.
Make sure it is that article with that title
a) What was the primary aim?
b) What was the secondary aim?
c) What was the hypothesis?
d) How was the hypothesis tested (what were the methods)?