1 Department of Medicine, Kaiser Permanente Oakland Medical Center, Oakland, CA.
2 Division of Research, Kaiser Permanente Northern California, Oakland, CA. Electronic address: Joan.C.Lo@kp.org.
3 Department of Allergy, The Permanente Medical Group, Kaiser Permanente Fremont Medical Center, Fremont, CA.
4 Division of Research, Kaiser Permanente Northern California, Oakland, CA.
5 Department of Medicine, Kaiser Permanente Oakland Medical Center, Oakland, CA; Current affiliation: Division of Allergy and Clinical Immunology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD.
6 Division of Pulmonary, Allergy & Critical Care Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, CA; Stanford Center for Asian Health Research and Education, Stanford, CA.