“…Nineteen were qualitative, 5,7,9,25‐40 two quantitative 41,42 and two mixed methods 43,44 . In fifteen studies, PPI with YPCC was the outcome of interest 5,7,9,25,28‐32,35,37‐40,42 . In eight studies, it was applied as study method 26,27,33,34,36,41,43,44 .…”