Received December 29, 2007; Revised January 28, 2008; Accepted February 26, 2008. Disclosure Information: Nothing to disclose. This work was made possible by generous support from the James S McDonnell Foundation, St Louis, MO. Members of the McDonnell Norms Group are listed in the Appendix. Correspondence address: Timothy G Buchman, PhD, MD, Washington University in St Louis, 660 South Euclid Ave, Mailstop 8109, St Louis, MO 63110. email: [email protected]
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A 2008 study studied this question.