As I understand it, the Centre for Posttraumatic Mental Health at the University of Melbourne is an academic centre rather than one that provides treatment. But the director of that centre is renowned internationally for his knowledge of post-traumatic mental health conditions. He would certainly be liaising with professionals around the world.
He was the chair of the International Society for Traumatic Stress Studies, and through that avenue he liaises with professionals and academics around the world in understanding what works, what doesn't, and what the latest research is saying. He provides that not just through academic peer-reviewed journal articles, but also through information updates in reports and things from his centre.
On other contact with some of the specialist centres, I understand that some of our mental health professionals liaise with others around the world, but I can't give you any details on to what extent that occurs.