Single and multiple exposure tolerance study of polystyrene sulfonate gel: a phase I safety and colposcopy study - Mauck, Christine K.; Weiner, Debra H.; Ballagh, Susan A.; Creinin, Mitchell D.; Archer, David F.; Schwartz, Jill L.; Pymar, Helen C.; Lai, Jaim-Jou; Rencher, William F.; Callahan, Marianne M.; CONRAD (Contraception, 2004)