1. Assistant Research Professor, University of California, Davis Medical Center, USA, June 2016- September 2016.
2. Visiting Researcher, School of Medicine, Stanford University, Paulo Alto, CA, USA, Sept 18 -27, 2013.
3.Visiting Researcher, Institute of Physics Institute of Physics, Nicolaus Copernicus University, Torun, Poland, Feb 18, 2011 to March 01, 2011.