Donpunha, W.; Nantawanichakorn, C.; Sriwaourai, S.; Kamruecha, W.; Kamolrat, T.; Chanavirut, R.; Nakmareong, S.; Yonglitthipagon, P.; Chatchawan, U. The effect of towel-curl exercise on strength of toe flexor muscles in elderly. Arch AHS 2017, 28, 329-338.