ASEAN J Rehabil Med. Vol 30 No.1 (2020) : January - April 2020 Original Articles / นิพนธ์ต้นฉบับ The Effectiveness of Indoor Socks with Medial Arch Support in Decreasing Pain in Patients with Posterior Tibial Tendon Dysfunction: a Prospective, Double-blinded, Randomized Controlled Trial