1. Department of Biology, Stanford University, Stanford, California, USA
2. Hopkins Marine Station, Stanford University, Pacific Grove, California, USA
3. Department of Materials Science and Engineering, Stanford University, Stanford, California, USA
4. Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
5. Center for Excellence in Pulmonary Biology, Department of Pediatrics, Stanford University, Stanford, California, USA