![Racial and Ethnic Differences in Serum Cotinine Levels of Cigarette Smokers]()
Racial and Ethnic Differences in Serum Cotinine Levels of Cigarette SmokersCaraballo, Ralph S.; Giovino, Gary A.; Pechacek, Terry F.; Mowery, Paul D.; Richter, Patricia A.; Strauss, Warren J.; Sharp, Donald J.; Eriksen, Michael P.; Pirkle, James L.; Maurer, Kurt R. · JAMA · 1998