1 Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Department of Medicine, University of California San Francisco (UCSF) Medical Center, San Francisco, California. Electronic address: lulu.tsao@ucsf.edu.
2 Division of Hospital Medicine and Data Core, Department of Medicine, UCSF Medical Center, San Francisco, California.
3 Department of Obstetrics, Gynecology, and Reproductive Sciences, UCSF Medical Center, San Francisco, California.
4 Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Department of Medicine, University of California San Francisco (UCSF) Medical Center, San Francisco, California.