Healthy fitness assessment
① Grip strength test (kg): Muscle strength was assessed using a grip dynamometer; the left and right hands were tested three times each and the best result was taken. ② Back scratch test (cm): The patients were made to stand with their back straight, the right hand placed on the back around the right shoulder with the palm facing the back and the left hand placed on the lower back with the palm facing away from the back. The patients were asked to move the two hands toward each other as much as possible along the spine and to finally touch or overlap each other. When the movement was stable for more than 2 s, the distance between the fingertips of the middle fingers of both hands was measured, and the position of the hand was interchanged for the test. If the fingers of both hands overlapped each other, it was recorded as a positive number, otherwise it was a negative number. This test was used to assess shoulder-dorsal joint flexibility. ③ 30-s chair standing test (times): the number of times the patient could complete the sitting to standing position on a 45 cm-high chair within 30 s. This test assessed muscular fitness.