“…All used a questionnaire or structured interview; one was an informal survey [48]. One study [46] used a mixture of multiple choice and open questions, four used questions requiring yes/no/indifferent answers [40,45,47,52], three used Likert rating scales [25,52,54], two, [39,51] used open questions and Deeks and Byatt [55] used a variety of questioning methods. Details of questions were not provided in seven of the seventeen papers [23,29,37,48,49,50,53].…”