1 Pulmonary Critical Care Section, VA San Diego Healthcare System, La Jolla, CA; Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, University of California San Diego (UCSD), La Jolla, CA.
2 Pulmonary Critical Care Section, VA San Diego Healthcare System, La Jolla, CA; Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, University of California San Diego (UCSD), La Jolla, CA. Electronic address: lca@ucsd.edu.