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External validity of randomized controlled trials in older adults, a systematic review
van Deudekom FJ,
Postmus I,
van der Ham DJ,
Pothof AB,
Broekhuizen K,
et al.
(2017)
External validity of randomized controlled trials in older adults, a systematic review.
PLOS ONE 12(3): e0174053.
https://doi.org/10.1371/journal.pone.0174053