Name Info Provider Link
subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0025-7125(18)30132-9
Walking Problems free resource MedlinePlus Health Information https://medlineplus.gov/walkingproblems.html
subscription/membership/fee required W.B. Saunders http://journals.elsevierhealth.com/retrieve/pii/S0025-7125(18)30132-9
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S0025-7125(18)30132-9