“…All of the studies reviewed in this article described in detail the measurement scales and operationalisation strategies adopted for the explanatory (treatment) and outcome variables. In terms of the sample selection, nine studies used a random sampling frame, such as probability (Kim, 2019), representative (Porumbescu et al, 2020) and stratified (Cai et al, 2020;Lee & Park, 2020a, 2020b sampling. The sampling approaches used in the remaining 21 studies were coded as non-random due to their explicit mention of having used a nonprobability (e.g., Kim & Kim, 2016a, 2016b, unrepresentative or convenience (Stroik et al, 2019) sampling method.…”