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By Stephanie Nebehay GENEVA (Reuters) - An independent advisory body will decide in August at the earliest on whether to recommend widespread introduction of an Ebola vaccine, depending on results of clinical trials and the epidemic's course, the World Health Organization said on Friday. All three worst-hit countries in West Africa - Guinea, Liberia and Sierra Leone - aim to conduct phase III final-stage clinical trials of experimental vaccines. Liberia is already testing both the GlaxoSmithKline and Merck-NewLink vaccines, while Sierra Leone and Guinea are due to announce plans soon. WHO spokesman Christian Lindmeier, reporting on a three-day meeting of experts, told a news briefing: "Vaccine introduction is by no means a given and will depend on the results of clinical trials and recommendations from WHO's Strategy Advisory Group of Experts (SAGE) on vaccines and immunization.