^pHSR&D;
Center;
of;
Excellence,;
VA;
Puget;
Sound;
Health;
Care;
System,;
Seattle,;
WA;
98198,;
USA;
^pof;
Biostatistics,;
University;
of;
Washington,;
Seattle,;
WA;
98198,;
USA;
^pInternational;
Center;
for;
Mathematical;
Research,;
Peking;
University,;
Beijing;
100871,;
Chinal;
^pof;
Operations;
Research;
and;
Financial;
Engineering,;
Princeton;
University,;
Princeton,;
NJ;
08540,;
USA;
^pof;
Statisitcs,;
Southwest;
University;
of;
Finance;
and;
Economics,;
Chengdu;
611130,;
China;