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���The findings and conclusions in this article are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention (CDC).
������No outside funding was received for this project. The California Family Health Council covered all laboratory costs associated with performing the rocket immune-electrophoresis and chromatographic immunoassay testing performed at the Serological Research Institute. The Centers for Disease Control and Prevention, Division of Reproductive Health covered costs associated with performing the quantitative enzyme-linked immunoassay testing performed at CDC.