[1] Univ Pittsburgh, Dorothy P & Richard P Simmons Ctr Interstitial Lu, Pulm Allergy & Crit Care Med Div, Pittsburgh, PA 15260 USA
[2] Univ Calif Irvine, Coll Hlth Sci, Nursing Sci Program, Irvine, CA USA
[3] Univ N Carolina, Sch Nursing, Chapel Hill, NC USA
[4] Univ Pittsburgh, Sch Nursing, Dept Acute Tertiary Care, Pittsburgh, PA 15260 USA