Corrigendum: Impact of Opioid Consumption in Patients With Functional Gastrointestinal Disorders Research Topic: Pharmacological Treatments Affecting Gastro-Intestinal Motility in Man - Melchior, Chloé; Desprez, Charlotte; Wuestenberghs, Fabien; Leroi, Anne-Marie; Lemaire, Antoine; Gourcerol, Guillaume (Frontiers in Pharmacology, 2021)