[1] Georgetown Univ, Sch Med, Washington, DC USA
[2] Univ N Carolina, Chapel Hill, NC 27515 USA
[3] Univ Monterrey, San Pedro Garza Garcia, NL, Mexico
[4] Coll William & Mary, Williamsburg, VA USA
[5] Georgetown Univ, Washington, DC USA
[6] Georgetown Lombardi Comprehens Canc Ctr, Washington, DC USA