Events The Start-up Ceremony of the WHO Collaborating Centre for the Prevention and Rehabilitation of Hearing Impairment Held in Beijing Academic activity held by the WHO Collaborating Centre for the Prevention and Rehabilitation of Hearing Impairment Work Report（2008-2009） by China Rehabilitation and Research Center for Deaf Children & Hearing International National (China) Chapter The Signing Ceremony of a Cooperation Project —“Listen to the Harmonious”