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Funnel plot for estimating publication bias (ESS: effective sample size; 1: Aita et al., 2020; 2: Altawalah et al., 2020; 3: Binder et al., 2020; 4: Chen et al., 2020; 5: Guclu et al., 2020; 6: Hanson et al., 2020; 7: Jamal et al., 2020; 8: Landry et al., 2020; 9: Moreno‐Contreras et al., 2020; 10: Pasomsub et al., 2020; 11: Procop et al., 2020; 12: Rao et al., 2020; 13: Sakanashi et al., 2020; 14: Senok et al., 2020; 15: Vaz et al., 2020; 16: Williams et al., 2020)
