1 University of California (UC), San Diego, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA.
2 University of California (UC), San Diego, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA Doris A. Howell Pain and Palliative Care Service, La Jolla, CA, USA.
3 University of California (UC), San Diego, Skaggs School of Pharmacy and Pharmaceutical Sciences, La Jolla, CA, USA UC San Diego Department of Pediatrics, Rady Children's Hospital, San Diego, CA, USA brookie@ucsd.edu.