Effectiveness and characteristics of physical fitness training on aerobic fitness in vulnerable older adults: an umbrella review of systematic reviews by Cees M P M Hertogh, Johannes C van der Wouden, Elise P Jansma, Dennis Visser, Elizabeth M Wattel, Karin H L Gerrits, Franka J M Meiland, Aafke J de Groot, Ewout B Smit

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