1 Hospice and Palliative Medicine, Stanford University, Stanford, CA, United States of America; VITAS Healthcare, Miami, FL, United States of America. Electronic address: henryzeng87@gmail.com.
2 Hospice and Palliative Medicine, Stanford University, Stanford, CA, United States of America.
3 Hospice and Palliative Medicine, Stanford University, Stanford, CA, United States of America; VITAS Healthcare, Miami, FL, United States of America.