“…The studies reflected a variety of sampling methods and data collection methods. For example, interviews were conducted in 34 studies [10, 12, 13, 25, 27, 28, 30-32, 34-36, 38-50, 52-58, 60, 61], focus group methods were used in three [19,32,37], and interviews and focus groups were used in two studies [29,51]. Two studies used a mixed method approach [26,59].…”