State-of-the-art lentiviral vectors for research use: risk assessment and biosafety recommendations., Pauwels, Katia, Gijsbers Rik, Toelen Jaan, Schambach Axel, Willard-Gallo Karen, Verheust Céline, Debyser Zeger, and Herman Philippe , Curr Gene Ther, 2009 Dec, Volume 9, Issue 6, p.459-74, (2009)