Egger’s regression tests: A. Intercept = −1.23 [95% standard error confidence interval: −2.88–0.41], t = −1.47, p>0.05; B. Intercept: −3.16 [95% standard error confidence interval: −5.90– −0.42], t = −2.26, p=0.02. C: Intercept: 0.57 [95% standard error confidence interval: −1.55–2.68], t=0.53, p>0.05. D: Intercept: −6.03 [95% standard error confidence interval: −11.29– −0.76], t=−2.24, p=0.04