1. Clinical Evaluation Sciences, GlaxoSmithKline King of Prussia, PA 19406, USA.
2. Division of General Medical Disciplines, Stanford University School of Medicine, Stanford, CA 94305, USA.
3. Clinical Effectiveness and Safety, GlaxoSmithKline, King of Prussia, PA 19406, USA.
4. Clinical Effectiveness and Safety, GlaxoSmithKline, Research Triangle Park, NC 27709, USA.