“…The included articles represent a range of countries with three from the USA (Edelstein et al, 2009;Lutz et al, 2019;Nugent and Cummings, 2014), two from Canada (Heisel and Flett, 2016;Wadhwa and Heisel, 2019), and one each from Japan (Awata et al, 2007), Taiwan (Lee et al, 2017), Israel (Carmel, 2017), and Switzerland (Durst et al, 2020), with one further article using social media to recruit an international sample (O' Rourke et al, 2018). Measurement development and validation across the different scales were conducted with community, out-patient, and clinical samples ranging in age from 50 to 99 years.…”