Heffner John E, Highland Kristin, Brown Lee K
Medical University of South Carolina, Division of Pulmonary and Critical Care Medicine-812CSB, 96 Jonathan Lucas Street, P.O. Box 250623, Charleston, SC 29425, USA.
Am J Respir Crit Care Med. 2003 Jun 15;167(12):1591-9. doi: 10.1164/rccm.200301-048PP.