Iwamoto, Jun, Tsuyoshi Takeda, Yoshihiro Sato, and Hideo Matsumoto. 2010. “Associations of Serum Leptin Concentration With Gender, Fat Mass, Interleukins, and Growth Factors in Patients With Osteoarthritis of the Knee”. Rheumatology Reports 2 (1):e6. https://doi.org/10.4081/rr.2010.e6.