Centers for Disease Control and Prevention. (September, 2014) Behavioral Risk Factor Surveillance System. Retrieved from http://www.cdc.gov/brfss/.
2.
HuS. S.PierannunziC.BalluzL. (2011) Integrating a multimode design into a national random-digit-dialed telephone study. Preventing Chronic Disease8(6): A154.
3.
OkoroC. A.StoodtG.RohrerJ. E.StrineT. W.LiC.BalluzL. S. (2014) Physical activity patterns among US adults with and without serious psychological distress. Public Health Reports29(1): 30–38.
