By Tenzin Nyidon  DHARAMSHALA, April 29: The President of the Tibetan government-in-exile, known officially as the Central Tibetan Administration, Penpa Tsering refuted the recent remarks made by the Chinese Foreign Ministry spokesperson Wang Wenbin regarding non-existence of back-channel dialogue with China. Tsering was addressing the Tibetan community in Zurich on Saturday. “When discussing with a visiting group of Indian journalists