Expert opinion: prevalence of HPV types and vaccination efficacy Trial results so far are promising, but further long-term follow-up studies are needed. by Dr Anne Szarewski Sign in to continue Sign In Email address Password Stay signed in Trouble signing in? Reset password: Click here Need help? Email us Register FREE Limited free articles a month Free email bulletins Register Now Register Now Take a 30-day trial Join MIMS now and pay nothing for the first 30 days Join GPOnline now and pay nothing for the first 30 days Sign Up Sign Up