Hepatitis B, C and human immunodeficiency virus knowledge among the general greek population: results from the Hprolipsis nationwide survey oleh Sylvia Kaskafetou, Argiro Karakosta, Vana Sypsa, Natasa Kalpourtzi, Magda Gavana, Apostolos Vantarakis, George Rachiotis, Grigoris Chlouverakis, Grigoris Trypsianis, Paraskevi V. Voulgari, Yannis Alamanos, George Papatheodoridis, Giota Touloumi, on behalf of the Hprolipsis study group