Total Lung Injury Scores in Newborn Piglets With Bronchoalveolar Lavage–Induced Respiratory Distress Syndrome Treated With Nasal Continuous Positive Airway Pressure Without or With Surfactant Treatment, Using the Intubation–Surfactant–Extubation (Insure) Method or Different Doses (100, 200, 400, or 600 mg/kg) of Nebulized Surfactant