1. Fan Li is Assistant Professor, Department of Statistical Science, Duke University, Durham, NC 27708 . Alan M. Zaslavsky is Professor, Department of Health Care Policy, Harvard Medical School, Boston, MA 02115 . We thank David Banks, Hal Stern, the associate editor, and two reviewers for constructive comments that helped to improve the manuscript significantly. We also thank Ronald C. Kessler and Jennifer Green for insights into the NCS-A data and school assessment of emotional distress, and Nancy...