Townsend A, Mohon R T
Department of Pediatrics, James H. Quillen College of Medicine, East Tennessee State University, Johnson City 37614, USA.
Pediatr Pulmonol. 1997 Jun;23(6):460-3. doi: 10.1002/(sici)1099-0496(199706)23:6<460::aid-ppul11>3.0.co;2-2.