HONG KONG, Feb 18 (Reuters) - Well-known Chinese dealmaker Bao Fan, founder of investment bank China Renaissance Holdings Ltd (1911.HK), has gone missing in the latest disappearance of a top business executive in the country, unnerving investors. The dealmaker's disappearance is the latest in a series of cases of high-profile Chinese executives going missing with little explanation during a sweeping anti-corruption campaign spearheaded by President Xi Jinping. The reasons for Bao's disappearance are unclear. Here are five facts about Bao and his firm -- * Bao entered China's prestigious Fudan University in 1989, and later received his master's degree from...