Yoichi Nishimaru (西丸 與一, Nishimaru Yoichi; 14 March 1927 – 3 April 2020) was a Japanese physician specializing in medical jurisprudence. His books were so popular that they became best-sellers in Japan.
Source: “Yoichi Nishimaru”, English Wikipedia (CC BY-SA 4.0), excerpt
