Naltrexone with or without guanfacine for preventing relapse to opiate addiction in St.-Petersburg, Russia. - Krupitsky, Evgeny; Zvartau, Edwin; Blokhina, Elena; Verbitskaya, Elena; Tsoy, Marina; Wahlgren, Valentina; Burakov, Andrey; Masalov, Dimitry; Romanova, Tatyana N.; Palatkin, Vladimir; Tyurina, Arina; Yaroslavtseva, Tatyana; et al. (Drug & Alcohol Dependence, 2013)