Yabe Yutaka, Hatori Masahito, Kumagai Jun, Koizumi Noriyuki, Sakuma Tsutomu, and Kawamura Masanori. 2009. “Heterotopic Ossification of the Distal Portion of Biceps Femoris”. Upsala Journal of Medical Sciences 111 (3):321-27. https://doi.org/10.3109/2000-1967-058.