- Correspondence to Tom Nadarzynski, Division of Public Health and Primary Care, Brighton and Sussex Medical School, Room 321, Mayfield House, Falmer, Brighton BH1 9PH, UK;
- Received September 10, 2013
- Revised January 30, 2014
- Accepted April 2, 2014
- First published April 30, 2014.
Abstract in Polish
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