PLoS Med 15(7): e1002615. https://doi.org/10.1371/journal. pmed.1002615
Reprinted from Australian Family Physician Vol. 39, No. 10, october 2010
Accessed 15th of October 2015
PLOS ONE | www.plosone.org
September 2014 | Volume 9 | Issue 9 | e103657
Western Pac Surveill Response J. 2014 Oct-Dec; 5(4): 34–46.
Published online 2014 Dec 18. doi: [10.5365/WPSAR.2014.5.4.007]