A volunteer-supported walking programme to improve physical function in older people (the POWER Study): study protocol for a randomised controlled trial by Nina Grede, Anja Rieckert, Julia Muth, Joana Steinbuck, Sabine Weissbach, Annika Schneider, Beate Weber-Schicker, Ellen Freiberger, Nikita Jegan, Norbert Donner-Banzhoff, Andreas Sönnichsen

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