[1] Univ Maryland, College Pk, MD 20742 USA
[2] Louisiana State Univ, Sch Publ Hlth, New Orleans, LA USA
[3] Univ N Carolina, Chapel Hill, NC USA
[4] Johns Hopkins Bloomberg Sch Publ Hlth, Baltimore, MD USA
[5] NHLBI, Bethesda, MD 20892 USA
[6] San Diego State Univ, San Diego, CA 92182 USA
[7] Univ S Carolina, Columbia, SC 29208 USA
[8] Univ Penn, Philadelphia, PA 19104 USA