Chukwuocha, U. M.; Ogboeze, J. C.; Bosede, A. O.; Dozie, U. W.; Ekeleme, U. G.; Akam, V. N.; Chukwu, R. O. Use of facemask during the COVID-19 pandemic in Southeastern Nigeria: an observational study: 10.55131/jphd/2022/200209. J Public Hlth Dev 2022, 20, 110-125.