- Stereo Taxis and Gamma Knife Neurosurgery, Singapore General Hospital
- Microsurgery, Postgraduate Medical Institute Singapore General Hospital
- Mastering Neurovascular & Micro Surgery, Nagoya - Japan, 2002
- Neurovascular Diseases, Bicetre Medical School Paris Sud University – France & Mahidol University, 2005-2006
- Mastering Spine Surgery, St.Trudo Hospital, Brussels - Belgia, 2009
- Microscopic and Endoscopic Surgery, IRCAD- University of Strasbourg - France, 2011