Postnatal nutritional deficit is an independent predictor of bronchopulmonary dysplasia among extremely premature infants born at or <28 weeks gestation: Some methodological issues
1 Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran; Reproductive Endocrinology Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
2 Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. Electronic address: mohammadpanahi55@yahoo.com.