1 Department of Medicine, Kaiser Permanente Oakland Medical Center, Oakland, California.
2 Division of Research, Kaiser Permanente Northern California, The Permanente Medical Group, Pleasanton, California. Electronic address: joan.c.lo@kp.org.
3 Division of Research, Kaiser Permanente Northern California, The Permanente Medical Group, Pleasanton, California.
4 Department of Dermatology, Stanford University School of Medicine, Stanford, California; Stanford Center for Asian Health Research and Education, Stanford, California.
5 Department of Dermatology, The Permanente Medical Group, Kaiser Permanente Oakland Medical Center, Oakland, California.
6 Department of Allergy, The Permanente Medical Group, Kaiser Permanente Fremont Medical Center, Fremont, California.
7 Stanford Center for Asian Health Research and Education, Stanford, California; Division of Pulmonary, Department of Medicine, Allergy & Critical Care Medicine, Stanford University School of Medicine, Stanford, California.