Seroprevalence of antibodies against hepatitis A and E among the general population in 5 provinces, Lao People’s Democratic Republic: Variation according to location - Vilaysone Khounvisith; Siriphone Virachith; Nouna Innoula; Latdavone Khenkha; Bounta Vongphachanh; Jan Hattendoft; Peter Odermatt; Judith M Hübschen; Antony P Black (PLoS ONE)