mohammad gharavi fard department of pediatric anesthesiology, school of medicine, mashhad university of medical sciences,mashhad, iran arash peivandi assistant professor of anesthesiology. cardiac anesthesia research center, mashhad university of medical sciences, mashhad, iran shahram amini associate professor of anesthesiology and critical care program director, anesthesiology residency chief, division of critical care department of anesthesiology mashhad university of medical sciences mashhad, iran tayebeh beygom haji seyed abootorabi resident of anesthesiology, department of anesthesiology mashhad university of medical sciences mashhad, iran saeed bayyenat assistant professor of anesthesiology , department of anesthesiology, baqiyatallah university of medical sciences, tehran, iran. alireza sabzevari assistant professor of anesthesiology.surgical oncology research center,mashhad university of medical sciences mashhad, iran

حمید شهباز محمدی hamid shahbaz mohammadi اسکندر امیدی نیا eskander omidinia عباس صاحبقدم لطفی abbas sahebghadam lotfi رضا صغیری reza saghiri

tatiana kuznetsova department of virology, national institute for health development, tallinn, estonia tatjana tallo department of virology, national institute for health development, tallinn, estonia; department of diagnostics and vaccine, unit for molecular typing, swedish institute for communicable disease control, stockholm, sweden vadim brjalin department of internal medicine, west-tallinn central hospital, tallinn, estonia; department of internal medicine, west-tallinn central hospital, paldiski road 68, 10617, tallinn, estonia. tel: +372-6511472, fax: +-372-6511472 irina reshetnjak department of virology, national institute for health development, tallinn, estonia riina salupere department of internal medicine, university of tartu, tartu, estonia ljudmilla priimagi department of virology, national institute for health development, tallinn, estonia

maryam daram hepatitis b molecular laboratory, department of virology, school of public health, tehran university of medical sciences, tehran, iran ghodratollah montazeri digestive disease research center, shariati hospital, tehran, iran hadi karimzadeh hepatitis b molecular laboratory, department of virology, school of public health, tehran university of medical sciences, tehran, iran reza malekzadeh digestive disease research center, shariati hospital, tehran, iran mahmood mahmoodi department of epidemiology, school of public health, tehran university of medical sciences, tehran, iran zahra goodarzi hepatitis b molecular laboratory, department of virology, school of public health, tehran university of medical sciences, tehran, iran

Ghodratollah Montazeri, Hadi Karimzadeh, Hossein Keyvani, Mahmood Mahmoodi, Maryam Daram, Michael Roggendorf, Reza Malekzadeh, Seyed Moayed Alavian, Seyed Mohammad Jazayeri, Shahram Mirmomen, Zahra Goodarzi,

Alireza Sabzevari, Arash Peivandi, Mohammad Gharavi fard, Saeed Bayyenat Shahram Amini, Tayebeh beygom Haji Seyed Abootorabi,