By Amina Niasse NEW YORK (Reuters) -WeightWatchers said on Monday it will partner with Amazon to deliver medications including injectable GLP-1 obesity treatments for its members, driving the telehealth provider's shares up 9% as investors expected financial benefits from making it easier to fill prescriptions. WeightWatchers customers will be able to check whether medications are in stock and have the refrigerated drugs delivered more efficiently by using the Amazon Pharmacy option on its website, said WeightWatchers Chief Operating Officer Jon Volkmann. WeightWatchers, also known as WW International, emerged from bankruptcy in July having shed debt and with a plan to compete for online weight-loss customers. Shares of the company rose over 9% to $29.39 in afternoon trading. While its riv

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