Objective assessment of abnormal gait in patients with rheumatoid arthritis using a smart-phone - Yamada, M; Aoyama, T; Mori, S; Nishiguchi, S; Okamoto, K; Ito, T; Muto, S; Ishihara, T; Yoshitomi, H; Ito, H (Rheumatol Int, 2012)