[1] Yale Univ, New Haven, CT USA
[2] Cooley Dickinson Hosp, Pulm Allergy & Crit Care Med, Florence, MA USA
[3] Yale Univ, Sect Pulm Crit Care & Sleep Med, Internal Med, New Haven, CT USA
[4] Yale Univ, Yale Ctr Med Informat, New Haven, CT USA
[5] Yale Univ, Sect Pulm Crit Care & Sleep Med, Sch Med, New Haven, CT USA