P5575Practice-level variation in use of optimal medical treatment during hospitalization: a multi-level methodological approach. (28th August 2018) - Lee, J H; Pakr, B E; Park, Y J; Kim, H N; Song, J H; Kim, N K; Jang, S Y; Bae, M H; Yang, D H; Park, H S; Cho, Y; Chae, S C; et al.