Laksmi, P.W., Setiati, S., Tamin, T.Z., Soewondo, P., Rochmah, W., Nafrialdi, N. and Prihartono, J. 2017. Effect of Metformin on Handgrip Strength, Gait Speed, Myostatin Serum Level, and Health-related Quality of Life: A Double Blind Randomized Controlled Trial among Non-diabetic Pre-frail Elderly Patients. Acta Medica Indonesiana. 49, 2 (Aug. 2017), 118.