Topographical relationship between the accessory hepatic duct and the hepatic artery system, Takashi Tanaka, Takayuki Nakada, Tetsufumi Ito, Rieko Kominami, Takahiro Sonomura, Miyuki Kagaya, Katsushi Kawai & Satoru Honma, Anatomical Science International, 96:112-118, Jan. 2021