HTR2A and obesity due to melanocortin 4 receptor deficiency: Odds ratio (OR) including 95% confidence intervals (CI) for 5HT2A rs6311 (dominant effect of the A allele, AA & AG vs GG), 5HT2C rs3813929 (effect of the T vs C alleles) and COMT rs4680 (recessive effect of the G allele, GG vs GA & AA) in relation to obesity phenotypes.