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Smeets RJ, Wittink H, Hidding A, Knottnerus JA.Smeets RJ, et al. Among authors: wittink h.Spine (Phila Pa 1976). 2006 Jan 1;31(1):90-7; discussion 98. doi: 10.1097/01.brs.0000192641.22003.83.Spine (Phila Pa 1976). 2006.PMID: 16395183
Elbers S, Pool J, Wittink H, Köke A, Scheffer E, Smeets R.Elbers S, et al. Among authors: wittink h.JMIR Res Protoc. 2020 Aug 18;9(8):e18632. doi: 10.2196/18632.JMIR Res Protoc. 2020.PMID: 32808931Free PMC article.
van Dijk H, Köke AJA, Elbers S, Mollema J, Smeets RJEM, Wittink H.van Dijk H, et al. Among authors: wittink h.Int J Environ Res Public Health. 2023 Jan 16;20(2):1634. doi: 10.3390/ijerph20021634.Int J Environ Res Public Health. 2023.PMID: 36674387Free PMC article.Review.