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Flow of primary study inclusion.
Notes. K/k is defined as number of groups.
aFeldstein Ewing et al., 2011; Glynn & Moyers, 2010; Klonek et al., 2014.
bE.g. Laws et al., 2015 [Physicians as Counselors coding system, (PaCCS)]; Lord et al., 2015 [Language Style Synchrony (LSS)]
