E. Marfiani, J. Ichwani, N. Widajanti, D. Maranatha, and M. Amin, “RELATIONSHIP BETWEEN LEVEL OF SERUM ADIPONECTIN AND FRAILTY IN ELDERLY PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE”, IJTID, vol. 8, no. 2, pp. 101–107, Jul. 2020.