title: The authors reply.
authors.affiliation: Department of Systems, Populations and Leadership, School of Nursing, University of Michigan, Ann Arbor, MI, and Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, MI Department of Critical Care Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, PA Department of Critical Care Medicine, School of Medicine, University of Pittsburgh, Pittsburgh, PA, and Department of Health Policy and Management, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA.
authors.forename: Deena Kelly
authors.initials: DK
authors.lastname: Costa
authors.forename: David J
authors.initials: DJ
authors.lastname: Wallace
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Kahn
mesh_terms: D003422:Critical Care; D016638:Critical Illness / Q000401:mortality*; D005260:Female; D017052:Hospital Mortality / Q000639:trends*; D006801:Humans; D007362:Intensive Care Units; D008297:Male; D010561:Personnel Staffing and Scheduling / Q000458:organization & administration*; D000078329:Workforce