Benefits of catch-up in vaccination against human papillomavirus in medium- and low-income countries.

Baussano I, Lazzarato F, Ronco G, Dillner J, Franceschi S.

Int J Cancer 2013; 133: 1876-81. doi: 10.1002/ijc.28197.

http://www.ncbi.nlm.nih.gov/pubmed/23564420