FTO and obesity due to melanocortin 4 receptor deficiency: A meta‐analysis on the variation in FTO (SNPs rs9939609, rs1421085, rs1558902, rs8050136) and obesity‐related phenotypes in children and adolescents from 23 studies [40] included European, Asian [46], and Amerindian [47] participants showing replication across studies conducted in diverse countries and ancestries, study designs, sample sizes, and analytical models [48].