“…In addition, we omitted papers that use models already described by studies in our sample and that analyze the same types of policies. As a result, of the following three pairs of related studies, we included only the first of each pair in the sample: Beckenbach et al (2018) and Beckenbach and Briegel (2010), Gerst, Wang, Roventini, et al (2013), Gerst, Wang, and Borsuk (2013), and Richstein et al (2014) and Chappin et al (2017). Our search procedure started in September 2018 and finished in January 2019.…”