Subject: Methodologic Changes in the Behavioral Risk Factor Surveillance System (BRFSS) in 2011 and Potential Effects on Prevalence Estimates 

Here's how the BRFSS telephone survey has adjusted to the rapid rise in the proportion of U.S. households that have a cellular telephone but no landline telephone.

Forwarding link to subject article in today's MMWR.
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6122a3.htm?s_cid=mm6122a3_e%0d%0a

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