puits (1) spectroscopie (1) échantillonnage (1) azote (1) analyse (1) acide aminé (1) maladie (1) âge (1) enfant (1) ordre (1) Children (1) Inflammatory bowel diseases (1) Teenagers (1) Urine (1) Urea (1) Spectrum analysis (1) Sampling (1) Puberty (1) Pediatrics--Research (1) Pediatric gastroenterology (1) Patients (1) Order (1) Nuclear magnetic resonance (1) Nitrogen (1) Months (1) Human beings (1) Males (1) Magnetic resonance (1) Growth (1) Energy metabolism (1)