Pencegahan Kanker Penelitian Ravi Patel BMC PUBLIC HEALTH, CANCER PREVENTION, CLINICAL TRIALS, DANISH TWIN TATTOO COHORT, HENRIK FREDERIKSEN, HPV VACCINE, JACOB VON BORNEMANN HJELMBORG, MEDICINE, RESEARCH, SCIENCE, SIGN, SIGNE BEDSTED CLEMMENSEN, UNIVERSITY OF SOUTHERN DENMARK Tato Mungkin Tingkatkan Risiko Kanker, Kata Para Ilmuwan