RBP4 and Ullrich congenital muscular dystrophy: Serum leptin, HMW adiponectin and RBP4 were analyzed by ELISA in sera from UCMD (n = 4), intermediate COL6-RM (n = 6), and BM patients (n = 6) and compared with either pediatric controls (n = 19) or adult controls (n = 6) and with DMD children as a disease control group (n = 10).