BMC NEPHROLOGY 2020 10.1186/s12882-020-01825-6 Urinary angiotensinogen as a surrogate marker predicting the antiproteinuric effects of angiotensin receptor blockers in patients with overt proteinuria: a multicenter prospective study Jeon1, J; Kim, DH; Jang, HR; Lee, JE; Huh, W; Kim, HY; Kim, DJ; Kim, YG