“…Data were collected solely through interviews in 22 studies, 99,100,102,108,109,111,113,[115][116][117]119,121,123,127,134,210,211,213,214,[216][217][218] solely through focus groups in three studies 101,130,209 and through a combination of interviews and focus groups in three studies. 110,[120][121][122]129 A further five studies used a combination of interviews and participant observation 107,112,[124][125][126]135,215 and one study combined focus groups and participant observation. 207 Only one study used participant observation without another form of data collection.…”