G. Alvarez, S. Harlow, C. Denman, and M. Hofmeister. Revista Panamericana De Salud Pública = Pan American Journal of Public Health, 25 (2):
120--127(February 2009)PMID: 19531306.
P. Wals, G. Deceuninck, {. Boucher, and M. Ouakki. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 46 (8):
e75--77(April 2008)PMID: 18444843.
R. Tsang, M. Sill, S. Skinner, D. Law, J. Zhou, and J. Wylie. Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America, 44 (12):
1611--4(June 2007)PMID: 17516405.