General Health Questionnaire | Telephone call or at participant’s home or at the University of Birmingham Answering ‘yes’ to any question outlined in the exclusion criteria shown in table 1
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Mini-Mental State Exam | At participant’s home or at the University of Birmingham A score <23
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Venous blood draw to assess serum 25(OH)D status | At participant’s home or at the University of Birmingham Serum 25(OH)D<30 nmol/L
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Physical activity monitoring (accelerometry) | At participant’s home or at the University of Birmingham A descriptive to be used during stratification
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