Massie R J, Mellis C M, van Asperen P P
Department of Respiratory Medicine, Royal Alexandra Hospital for Children, Camperdown, New South Wales, Australia.
Pediatr Pulmonol. 1997 Feb;23(2):117-9. doi: 10.1002/(sici)1099-0496(199702)23:2<117::aid-ppul7>3.0.co;2-m.