On May 1st, 2019, Prof. Dr. Prasit Watanapa, Dean of Faculty of Medicine Siriraj Hospital, along with Assist. Prof. Nanthasorn Zinboonyahgoon, Head of Siriraj Pain Management Clinical Training Center, Assist. Prof. Pramote Euasobhon, Director of International Pain Fellowship Program, and Assist. Prof. Nattha Saisavoey from Department of Psychiatry welcomed Prof. Dr. Lars Arendt-Nielsen, President of International Association for the Study of Pain (IASP) to visit the Faculty of Medicine Siriraj Hospital.