Porntip Khemnak. (1999) Hepatitis C virus seroprevalence and risk factors among patients attending sexually transmitted diseases and AIDS control section, Regional center 2, Saraburi. Mahidol University,:ม.ป.ท.Porntip Khemnak. 1999. Hepatitis C virus seroprevalence and risk factors among patients attending sexually transmitted diseases and AIDS control section, Regional center 2, Saraburi. ม.ป.ท.:Mahidol University,;Porntip Khemnak. Hepatitis C virus seroprevalence and risk factors among patients attending sexually transmitted diseases and AIDS control section, Regional center 2, Saraburi. ม.ป.ท.:Mahidol University, 1999. Print.