“…Sample sizes ranged between 1 ( 5 , 6 , 9 , 31 , 33 , 35 , 36 ) and 134 ( 34 ). This comprised seven case descriptions ( 5 , 6 , 9 , 26 , 31 , 33 , 36 ), six qualitative semi-structured interviews ( 7 , 8 , 27 – 30 ) (of which two are in fact separate analyses of a single data pool), one qualitative structured interview ( 34 ), one written questionnaire with open questions ( 37 ), and two qualitative interviews of unclear form ( 32 , 35 ). Nine also employed quantitative instruments to assess problems related to exercise ( 7 , 26 – 29 , 31 , 34 , 35 , 37 ).…”