[1] United Hosp Fund, New York, NY 10018 USA
[2] RAND Corp, Arlington, VA USA
[3] United Hosp Fund, Educ & Program Initiat, New York, NY USA
[4] Cincinnati Childrens Hosp Med Ctr, Cincinnati, OH 45229 USA
[5] Natl Hosp & Palliat Care Org, Alexandria, VA USA