Gusdani Harahap, W., and A. Nurwahyuni. “Factors Related to the Incidence of Hypertension Among Prospective Pilgrims in Medan, Indonesia During Embarkation Period 2016”. KnE Life Sciences, Vol. 4, no. 10, Feb. 2019, pp. 261–268, doi:10.18502/kls.v4i10.3728.