1 Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA.
2 Clinical Virology Laboratory, Stanford Health Care, Stanford, CA, USA.
3 Department of Pathology, Stanford University School of Medicine, Stanford, CA, USA; Clinical Virology Laboratory, Stanford Health Care, Stanford, CA, USA; Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA. Electronic address: [email protected].