Goldman Dana P, Chen Cynthia, Zissimopoulos Julie, Rowe John W
Schaeffer Center for Health Policy and Economics, University of Southern California, Los Angeles, CA 90089;
Saw Swee Hock School of Public Health, National University of Singapore, Singapore 117549.
Proc Natl Acad Sci U S A. 2018 Jan 16;115(3):435-437. doi: 10.1073/pnas.1720899115.