Randomization
Simple randomization was done according to a software-generated random number sequence posted on a dedicated and secure website available on a 24/7 basis. The website generated the randomization, but the sequence was concealed from investigators. Participants who were eligible were randomized to either the intervention group received Chinese pediatric Tuina intervention by professional chiropractors or the control group received standard care. Patients randomized to one arm could not cross over to the others during the study.