The effect of the look-back period for estimating incidence using administrative data. - Kim, Mira; Chae, Kyung-Hee; Chung, Youn-Jee; Hwang, HyeJin; Lee, MinKyung; Kim, Hyun-Kyung; Cho, Hyun-Hee; Kim, Mee-Ran; Jung, Chai-Young; Kim, Sukil (BMC Health Services Research, 2020)