RATIONALE: Neuroendocrine Cell Hyperplasia of Infancy NEHI is an important form of children's interstitial and diffuse lung disease chILD in which the diagnostic strategy has evolved. ...Clinicians should consider evaluating patients with NEHI for comorbidities including gastroesophageal reflux, aspiration and immune system abnormalities as these can contribute to the child's clinical picture and may influence clinical course and treatment....