TRAPPC9 and obesity due to melanocortin 4 receptor deficiency: Mutations in TRAPPC9 are associated with non-syndromic autosomal recessive intellectual disability (NS-ARID), assigned as “Intellectual Disability-Obesity-Brain Malformations-Facial Dysmorphism Syndrome” and “Intellectual developmental disorder, autosomal recessive 13” (OMIM #613192), and abbreviated as NIBP syndrome24, 28.