Written evidence from Prof. Jakub Bijak (Professor of Statistical Demography at University of 天发娱乐棋牌_天发娱乐APP-官网|下载), Dr Martin Hinsch (Research Fellow at University of 天发娱乐棋牌_天发娱乐APP-官网|下载), Dr Sarah Nurse (Research Fellow at University of 天发娱乐棋牌_天发娱乐APP-官网|下载), and Dr Toby Prike (Research Fellow at University of 天发娱乐棋牌_天发娱乐APP-官网|下载)