Pencegahan Kanker Penelitian Marcus Johnson BARNES, BARNES - JEWISH HOSPITAL, CANCER PREVENTION, CLINICAL TRIALS, COLDITZ, GAIN, GRAHAM A. COLDITZ, HARVARD SCHOOL OF PUBLIC HEALTH, HEALTH, HEALTHCARE, HPV VACCINE, MEDICINE, NEW ENGLAND JOURNAL OF MEDICINE, NORTH AMERICA, OF, RESEARCH, ST. LOUIS, UNITED STATES, UNIVERSITY SCHOOL OF MEDICINE, WASHINGTON UNIVERSITY Pakar Dorong Upaya Peningkatan Pencegahan Kanker