Kitagawa, Kodai, et al. “Relationship Between Foot Position and Lumbar Loads While Turning Patients on a Bed: An Investigation via Computational Simulation and Electromyography”. International Journal of Online and Biomedical Engineering (iJOE), vol. 17, no. 10, Oct. 2021, pp. pp. 131-143, doi:10.3991/ijoe.v17i10.25161.