- Correspondence to Dr Maciej L Goniewicz, Department of Health Behavior, Division of Cancer Prevention and Population Sciences, Roswell Park Cancer Institute, Elm & Carlton Streets / Carlton House A320, Buffalo, NY 14263, USA;
- Received 24 October 2012
- Accepted 31 January 2013
- Published in print 1 March 2013.
- Published online 6 March 2013.
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