“…Eight of the included reviews were characterized as systematic [ 15 , 17 , 18 , 19 , 20 , 22 , 23 , 24 ], and six of these were meta-analyses aiming at studying effects from complementary therapies on patient outcomes of quality of life (QoL) [ 15 , 18 , 19 , 20 , 22 , 23 ]. Eight articles reviewed only randomized controlled designs [ 15 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ], while three also included studies with other quantitative designs [ 16 , 17 , 25 ]. One of the randomized, controlled trials (RCT) in Levine and Balk [ 25 ] also comprised qualitative data collection.…”