Burden of hypertension and associated risks for cardiovascular mortality in Cuba: a prospective cohort study by Rojas, NA, Dobell, E, Lacey, BWH, Varona-Perez, P, Burrett, JA, Lorenzo-Vazquez, E, Martinez, MC, Sherliker, P, Constanten, SB, Rigau, JMM, Lopez, OJH, Morales, MAM, Aloma, IA, Estupiñan, FA, Gonzalez, MD, Muñoz, NR, Asencio, MC, Peto, R, Emberson, J, Herrera, AD, Lewington, S