Chén Wúzé 陳無擇 (real name 陳言 Chén Yán, zì Wúzé, 1131–1189), Southern Sòng physician of Qīngtián 青田 (Zhèjiāng); author of Sānyīn jí yī bìngzhèng fāng lùn 三因極一病證方論 (1174) — the foundational sānyīn (three-causes) etiological treatise that classifies disease causation as nèi yīn (internal — the seven affects), wài yīn (external — the six excesses), and bù nèi wài yīn (neither — accident, dietary error, etc.). Cited by 王肯堂 Wáng Kěntáng in KR3eh052 on the Kāiyuán-coin standard for dùliànghéng 度量衡 conversion of HànTáng dose-equivalents.