“…Table 2 describes study characteristics related to design of study, setting, number of participants, mean age, gender, inclusion and exclusion criteria, and follow-up. Two studies [19,20] were conducted largely in Asia, two others in Africa [16,18], and one in Europe [17]. Randomized trials sample size ranged from 50 [18] to 521 [17], and controlled clinical trials studies from 1,769 [20] to 3,438 [19], and typically included females between the ages of 20 and 40 years.…”