Clean water, sanitation and under-five children diarrhea incidence: Empirical evidence from the South Africa’s General Household Survey - Omotayo, Abiodun Olusola; Olagunju, Kehinde Oluseyi; Omotoso, Abeeb Babatunde; Ogunniyi, Adebayo; Otekunrin, Olutosin Ademola; Daud, Adebola Saidat (Springer, 2021)