1. Section of Gastroenterology and HepatologyDepartment of Internal MedicineUniversity of MissouriColumbiaMissouri
2. Department of PediatricsMedical College of WisconsinMilwaukeeWisconsin
3. Molecular Cytology CoreUniversity of MissouriColumbiaMissouri
4. Harry S. Truman Memorial Veterans' HospitalColumbiaMissouri