2014-present, Associate Professor, School of Preventive Medicine, Fourth Military Medical University, Xi’an, China 2011-2013, Medical Logistics Officer, United Nation Mission in Liberia, UN. 2007-2008, Fellowship, Centre for Evidence Based Medicine, University of Oxford, UK. 2007-2008, Visiting scholar, Department of Pubic Health and Primary Health Care, University of Oxford, UK. 2004-2006, University Lecturer in Epidemiology and Health Statistics, School of Preventive Medicine, Fourth Military Medical University, Xi’an, China 1998-2001, Research Fellow at Department of Health Statistics, School of Preventive Medicine, Xi’an, China

Epidemiology and Health Statistics; Evidence Based Medicine; Health Service & Management