UPDATE 1-GlaxoSmithKline CEO optimistic COVID-19 vaccine widely available in 2021
* Mass rollout would be challenging, GSK chief Walmsley says* She says immunisation development speed does not reduce safety (Adds remarks on vaccine safety)By Ludwig BurgerFRANKFURT, Sept 29 (Reuters) - The chief executive of GlaxoSmithKline, the...
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