A contaminant-free assessment of Endogenous Retroviral RNA in human plasma by Karamitros, T, Paraskevis, D, Hatzakis, A, Psichogiou, M, Elefsiniotis, I, Hurst, T, Geretti, A, Beloukas, A, Frater, J, Klenerman, P, Katzourakis, A, Magiorkinis, G