Iwai, K., Koyama, K., Okada, T., Nakazato, K., Takahashi, R., Matsumoto, S., . . . Hiranuma, K. (2016). Asymmetrical and smaller size of trunk muscles in combat sports athletes with lumbar intervertebral disc degeneration. Springerplus.

Iwai, Kazunori, Koji Koyama, Takashi Okada, Koichi Nakazato, Ray Takahashi, Shingo Matsumoto, Yosuke Yamamoto, and Kenji Hiranuma. "Asymmetrical and Smaller Size of Trunk Muscles in Combat Sports Athletes With Lumbar Intervertebral Disc Degeneration." Springerplus 2016.

Iwai, Kazunori, et al. "Asymmetrical and Smaller Size of Trunk Muscles in Combat Sports Athletes With Lumbar Intervertebral Disc Degeneration." Springerplus 2016.