Chang A B, Ditchfield M, Robinson P J, Robertson C F
Department of Thoracic Medicine, Royal Children's Hospital, Melbourne, Victoria, Australia.
Pediatr Pulmonol. 1996 Dec;22(6):416-20. doi: 10.1002/(SICI)1099-0496(199612)22:6<416::AID-PPUL12>3.0.CO;2-C.