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APA Citation
Murphy, R., Griffin, T. P., Gorey, S., Mannion, E., O'Shea, P., Mulkerrin, E., & Robinson, S. (n.d.). 124Understanding Vitamin D Levels in a Population of Frail Older Adults. Age and ageing, 47, v13–v60. http://access.bl.uk/ark:/81055/vdc_100095520761.0x000062