VOICE Credit: This activity has been approved for 1.0 VOICE (Category A) credit. For CE credit, participants can access this activity on page 325 or on the SNM Web site (http://www.snm.org/ce_online) through December 31, 2013. You must answer 80% or the questions correctly to receive 1.0 CEH (Continuing Education Hour) credit.
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Balon et al. (2011) studied this question.