Obesity is associated with high serotonin 4 receptor availability in the brain reward circuitry. - Mette E. Haahr; Peter Mondrup Rasmussen; Karine Madsen; Lisbeth Marner; C. Ratner; Nic Gillings; William F. C. Baaré; Gitte Moos Knudsen (NeuroImage, 2012)