Yin Bun Cheung is a Biostatistician at the National Cancer Centre Singapore. His academic interests include mortality models, analysis of survival time data and count data.

E-mail: ctecyb@nccs.com.sg

Paul Yip is a Senior Lecturer in statistics at the University of Hong Kong. His main interests include capture-recapture methodology and statistics as applied in medicine.

E-mail: sfpyip@hku.hk