PID associated with fertility regulating agents. Task Force on Intrauterine Devices, Special Programme of Research, Development and Research Training in Human Reproduction, World Health Organization. - Witoonpanich, P; Koetsawang, A; Koetsawang, S; Rachawat, D; Gupta, I; Ibeziako, P; Brown, SE; Iddenden, D; Apelo, R; de la Cruz, J; Bhatnagar, S; Molina, R; et al. (Contraception, 1984)