Longitudinal fecal amino acid profiles in extremely preterm infants: early-life determinants and associations with late-onset sepsis. - van Wesemael AJ; de Kroon RR; Frerichs NM; van Weissenbruch MM; van Kaam AH; de Boer NK; Struys EA; Niemarkt HJ; de Meij TG (Metabolomics : Official journal of the Metabolomic Society, 2026)