1. serum hepatitis B surface antigen positivity and urine samples have been collected
2. and risk of hepatocellular carcinoma. throughout a 2-month intervention period
3. Particularly striking was a marked synergis- as well as during a 2-month postinterven
4. tic interaction between viral and chemical tion follow-up period to fully determine
5. risk factors. Collectively these studies high- the dynamics of potential changes in phase