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Engels Y, Dautzenberg M, Campbell S, Broge B, Boffin N, Marshall M, Elwyn G, Vodopivec-Jamsek V, Gerlach FM, Samuelson M, Grol R.Engels Y, et al. Among authors: grol r.Fam Pract. 2006 Feb;23(1):137-47. doi: 10.1093/fampra/cmi091. Epub 2005 Oct 21.Fam Pract. 2006.PMID: 16243953
van den Hombergh P, Engels Y, van den Hoogen H, van Doremalen J, van den Bosch W, Grol R.van den Hombergh P, et al. Among authors: grol r.Fam Pract. 2005 Feb;22(1):20-7. doi: 10.1093/fampra/cmh714. Epub 2005 Jan 7.Fam Pract. 2005.PMID: 15640293
Engels Y, Campbell S, Dautzenberg M, van den Hombergh P, Brinkmann H, Szécsényi J, Falcoff H, Seuntjens L, Kuenzi B, Grol R; EPA Working Party.Engels Y, et al. Among authors: grol r.Fam Pract. 2005 Apr;22(2):215-22. doi: 10.1093/fampra/cmi002. Epub 2005 Feb 18.Fam Pract. 2005.PMID: 15722398
Rhydderch M, Edwards A, Marshall M, Elwyn G, Grol R.Rhydderch M, et al. Among authors: grol r.BMC Fam Pract. 2006 Jun 19;7:38. doi: 10.1186/1471-2296-7-38.BMC Fam Pract. 2006.PMID: 16784540Free PMC article.
Engels Y, van den Hombergh P, Mokkink H, van den Hoogen H, van den Bosch W, Grol R.Engels Y, et al. Among authors: grol r.Br J Gen Pract. 2006 Oct;56(531):781-7.Br J Gen Pract. 2006.PMID: 17007709Free PMC article.Clinical Trial.
Edwards A, Rhydderch M, Engels Y, Campbell S, Vodopivec-Jamsek V, Marshall M, Grol R, Elwyn G.Edwards A, et al. Among authors: grol r.Int J Health Care Qual Assur. 2010;23(1):8-21. doi: 10.1108/09526861011010640.Int J Health Care Qual Assur. 2010.PMID: 21387860
Rhydderch M, Edwards A, Elwyn G, Marshall M, Engels Y, Van den Hombergh P, Grol R.Rhydderch M, et al. Among authors: grol r.J Eval Clin Pract. 2005 Aug;11(4):366-78. doi: 10.1111/j.1365-2753.2005.00544.x.J Eval Clin Pract. 2005.PMID: 16011649Review.