Prime Minister Syed Yusuf Raza Gilani left for Pakistan on Saturday after attending the annual World Economic Forum held here.Besides participating in various sessions of the World Economic Forum, the Prime Minister during his four-day visit also held bilateral meetings with a number of world leaders, including the presidents of Swiss Federation and Azerbaijan, and the prime ministers of Denmark and Thailand.He also held meetings with chief executives of various international organizations, including Director General of World Health Organization (WHO), Executive Chairman of WEF Klaus Schwab and CEO of Microsoft Bill Gates.