1 Department of Radiation Oncology, Stanford University, Palo Alto, CA.
2 Department of Radiation Oncology, University of California, San Francisco, CA.
3 San Juan Bautista School of Medicine, Caguas, PR.
4 Christie Medical Physics and Engineering, Christie NHS Foundation Trust, Manchester, United Kingdom.
5 Department of Radiation Oncology, University of California, San Francisco, CA; Osher Center for Integrative Health, University of California, San Francisco, CA.
6 Department of Radiation Oncology, University of California, San Francisco, CA. Electronic address: [email protected].