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Bowler C, Boyle A, Branford M, Cooper SA, Harper R, Lindesay J.Bowler C, et al. Among authors: harper r.Age Ageing. 1994 Jul;23(4):307-11. doi: 10.1093/ageing/23.4.307.Age Ageing. 1994.PMID: 7976778
Schaeffer BZ, Fazio SA, Stocking JC, Adams JY, Liu A, Black HB, Harper RW, Cortes-Puch I, Albertson TE, Kuhn BT.Schaeffer BZ, et al. Among authors: harper rw.Respir Care. 2024 Apr 23:respcare.11544. doi: 10.4187/respcare.11544. Online ahead of print.Respir Care. 2024.PMID: 38653556
Harper RC, Sheppard S, Miller E, Stewart C, Clark CJ.Harper RC, et al.Health Expect. 2024 Apr;27(2):e14033. doi: 10.1111/hex.14033.Health Expect. 2024.PMID: 38556833Free PMC article.