1. Department of Physics, Stanford University, Stanford, CA, United States
2. Graduate School of Education, Stanford University, Stanford, CA, United States
3. Department of Physics, Current address Auburn University, Auburn, AL, United States
4. Stanford Medical School, Stanford, CA, United States
5. California State University – Fullerton, Fullerton, CA, United States
6. Department of Mechanical Engineering, Stanford University, Stanford, CA, United States