RT Article T1 Advance directives and medical treatment at the end of life JF Journal of health economics VO 23 IS 1 SP 111 OP 127 A1 Kessler, Daniel P. 1966- A2 McClellan, Mark B. 1963- LA English YR 2004 UL https://krimdok.uni-tuebingen.de/Record/1912451484 DO 10.1016/j.jhealeco.2003.08.006