IL37 and necrotizing enterocolitis: IL-37+ percentages were low throughout in T cells (combined non-NEC and NEC median, 0.34% ± IQR 0.2–0.7%), B cells (3.1% ± 2–6.5%), NK cells (3.8% ± 1.3–16.7%) and neutrophils (1.3% ± 0.5–3%), which were therefore not analyzed further.