Hypertension increases the risks of end-organ injury, maternal/fetal vulnerability, and total mortality. Throughout the world, it kills about 7.5 million people every year. During 1975–2015, the number of adults with hypertension increased from 594 million to more than 1.1 billion, mostly due to the increase in the low-income and middle-income countries (NCD Risk Factor Collaboration 2016, Lancet 15 Nov, 2016).