Biomarker assay validation for clinical trials: a questionnaire survey to pharmaceutical companies in Japan. (26th November 2018) - Ohtsu, Yoshiaki; Matsumaru, Takehisa; Katashima, Masataka; Kakehi, Masaaki; Kakuo, Hiroyuki; Suzuki, Takayoshi; Mabuchi, Masanari; Nakamura, Ryosuke; Nakamura, Takahiro; Katori, Noriko; Tanaka, Seiji; Saito, Yoshiro