1. National Cancer Registry Ireland; Cork Airport Business Park, Kinsale Road; Cork; Ireland
2. Department of Obstetrics & Gynaecology; University of Aberdeen; Foresterhill; Aberdeen; Scotland
3. Centre of Academic Primary Care; University of Aberdeen; Foresterhill; Aberdeen; Scotland
4. Department of Epidemiology and Community Medicine; University of Ottawa; 451 Smyth Rd.; Ottawa; Canada