The authors thank Eva Weissman, independent consultant, for her contributions specifying inputs for interventions, evaluating and compiling direct cost data, and assessing existing data on indirect costs. They also acknowledge the following Guttmacher colleagues: Suzette Audam, for data processing; Alyssa Browne, for research assistance; and Akinrinola Bankole, Sneha Barot, Heather Boonstra, Susan Cohen, Chelsea Polis, Gustavo Suarez, Cynthia Summers, Michael Vlassoff and Jonathan Wittenberg, for providing input and reviewing drafts.