HAMP and inflammatory bowel disease: Among the studies that recruited patients aged <18 years, Martinelli et al (Martinelli et al., 2016) detected higher serum hepcidin levels in pediatric patients with active IBD when compared to healthy patients (9.4 ± 15.8 nM [0.55–49.2] vs. 2.1 ± 2.6 nM [0.55–11.3], p = .003).