H. Nory Nejad, H. . Abednatanzi, S. . Soheily, and M. . Gholami, “Comparison of Resistance, Aerobic and Combined Trainings Effects on the FGF21 Serum Levels in Active Elderly Men”, Adv Nurs Midwifery, vol. 29, no. 4, pp. 7–11, Mar. 2021.