Population Services International (PSI) has launched a birth-spacing campaign to encourage the use of modern contraceptive methods, PSI staffers said on Tuesday, in a bid to reduce Cambodia’s high levels of maternal mortality. Heng Keng, health services director for PSI, said about 40 percent of married women use birth spacing, according to the organisation’s surveys, a similar number to two years ago. PSI’s campaign will focus on encouraging husbands to speak to their wives about the benefits of birth spacing and the promotion of specific methods.