N. B. Fritz, J. Gene-Morales, A. Saez-Berlanga, A. Juesas, J. Flandez, and J. C. Colado, “Resistance training for chronic low back pain in the elderly: A systematic review”, J. Hum. Sport Exerc., vol. 16, no. 3proc, pp. S1506-S1520, Sep. 2021.