U. S. Usman, A. M. Kurfi, Y. A. Misau, U. L. Bello, A. M. Maigoro, and A. I. Abdullahi, “Effect of training and supportive supervision on knowledge and practice of integrated diseases surveillance and response among primary health care workers in Kano State, Nigeria”, Ann Afr Med Res, vol. 1, no. 2, Dec. 2018.