[1] Department of Pediatrics, Columbia University, College of Physicians and Surgeons, New York, NY
[2] Bureau of Child Health, New York City Department of Health, New York, NY
[3] Department of Health Sciences, Jersey City State College, Jersey City, NJ
[4] Med. Hlth. Res. Assoc. New York C., New York, NY
[5] Division of Biostatistics, Columbia University, School of Public Health, New York, NY
[6] Department of Educational Psychology, City Univ. of New York Grad. Center, New York, NY
[7] Dept. Hlth. Behav. and Hlth. Educ., University of Michigan, School of Public Health, Ann Arbor, MI
[8] Pediatric Pulmonary Division, Columbia University, College of Physicians and Surgeons, New York, NY 10032