CHICAGO (Reuters) - Boys should be routinely vaccinated against the human papillomavirus or HPV in an effort to protect them from oral, anal and penile cancers, and to extend protection of girls from cervical cancer, U.S. vaccine advisers said on Tuesday.The Advisory Committee on Immunization Practices, which advises the U.S. Centers for Disease Control and Prevention, voted unanimously to recommend routine use of Merck & Co's Gardasil in 11- and 12-year-old boys to fight the sexually transmitted virus, with 13 yes votes and one abstention.Previously, the CDC had said doctors are free to use the vaccine in boys but had...