GSK, 1250 S Collegeville Rd, Collegeville, PA, 19426, USA. david.a.lipson@gsk.com. Perelman School of Medicine, University of Pennsylvania, 3400 Civic Center Blvd, Philadelphia, PA, 19104, USA. david.a.lipson@gsk.com. GSK, Stockley Park West, Iron Bridge Rd N, West Drayton, Uxbridge, UB11 1BT, UK.