[1] NCI, Canc Biomarker Res Grp, Div Canc Prevent, NIH, Rockville, MD 20850 USA
[2] NCI, Biometry Res Grp, Div Canc Prevent, NIH, Rockville, MD 20850 USA
[3] Univ Penn, Inst Regenerat Med, Dept Cell & Dev Biol, Abramson Canc Ctr,Perelman Sch Med, Philadelphia, PA 19104 USA
[4] Johns Hopkins Univ, Dept Pathol, Sol Goldman Pancreat Canc Res Ctr, Baltimore, MD USA
[5] Johns Hopkins Univ, Dept Med, Sol Goldman Pancreat Canc Res Ctr, Baltimore, MD USA
[6] Johns Hopkins Univ, Dept Oncol, Sol Goldman Pancreat Canc Res Ctr, Baltimore, MD USA