GCG and obesity due to melanocortin 4 receptor deficiency: The use of Medical Subject Headings (MeSH) was advocated to filter the search strategy on PubMed further. The eventual search strategy was formulated as follows: ("glucagon like peptides/administration and dosage"[MeSH Terms] OR "glucagon like peptides/therapeutic use"[MeSH Terms]) AND "obesity/drug therapy"[MeSH Terms]. For other databases, keywords were used to get the relevant articles.