“…Across studies, 48.0% ( n = 12) used a self-developed questionnaire, 12.0% ( n = 3) used a self-developed questionnaire with open-ended questions, 12.0% used a questionnaire with author modification of validated scale, 24.0% ( n = 6) used a questionnaire with validated scale, and 4.0% ( n = 1) used only open-ended questions without rating scale items (Brock & Beaman-Diglia, 2018). Six studies (21.4%) conducted an interview (Bailey & Blair, 2015; Blair, Fox, & Lentini, 2010; Fettig, Barton, Carter, & Eisenhower, 2016; Hancock, Kaiser, & Delaney, 2002; McCoy, Morrison, Barnett, Kalra, & Donovan, 2017; Park & Scott, 2009). Some researchers used objective measures such as: masked ratings (using videos with masked observers) or a normative comparison.…”