A cohort survey of the effect of an educational intervention on human papillomavirus vaccine-related knowledge and attitudes among pre-university female students in Singapore. Sarah Woon Ching Lim, Alicia Ying Ying Boo, Wee Chuan Tan, Eunice Su-Yin Png, Hang Keong Lee, Zi Ying Chang, Serene Xue Jia Wee, Brindha Balakrishnan, Kuan Siew Choong, Ian Kwong Yun Phoon Proceedings of Singapore Healthcare 2017, Vol. 26(1) 5–10