Rower JE, Meissner EG, Jimmerson LC, Osinusi A, Sims Z, Petersen T, Bushman LR, Wolfe P, McHutchison JG, Kottilil S, Kiser JJ. Serum and cellular ribavirin pharmacokinetic and concentration-effect analysis in HCV patients receiving sofosbuvir plus ribavirin. J Antimicrob Chemother. 2015 Aug; 70(8):2322-9.