Nonmonetary commodity incentives in family planning programs: a preliminary trial.
D000818:Animals; D003906:Developing Countries; D004467:Economics; D005193:Family Planning Services; D005260:Female; D005869:Ghana; D006801:Humans; D008892:Milk; D009042:Motivation; D010342:Patient Acceptance of Health Care; D012017:Referral and Consultation