Predicting the outcome of chronic kidney disease by the estimated nephron number: The rationale and design of PRONEP, a prospective, multicenter, observational cohort study oleh Imasawa Toshiyuki, Nakazato Takashi, Ikehira Hiroo, Fujikawa Hiroyuki, Nakajima Ryo, Ito Takahito, Ando Yutaka, Yoshimura Mitsuhiro, Nakayama Masaru, Yahata Kensei, Sasaki Osamu, Yaomura Takaaki, Katafuchi Ritsuko, Yamamura Tsuyoshi, Kawaguchi Takehiko, Nishimura Motonobu, Kitamura Hiroshi, Kenmochi Takashi, Shimatsu Akira