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Roter DL, Cole KA, Kern DE, Barker LR, Grayson M.Roter DL, et al. Among authors: barker lr.J Gen Intern Med. 1990 Jul-Aug;5(4):347-54. doi: 10.1007/BF02600404.J Gen Intern Med. 1990.PMID: 2197377Clinical Trial.
Kern DE, Harris WL, Boekeloo BO, Barker LR, Hogeland P.Kern DE, et al. Among authors: barker lr.J Gen Intern Med. 1990 May-Jun;5(3):218-24. doi: 10.1007/BF02600538.J Gen Intern Med. 1990.PMID: 2341921
Kern DE, Grayson M, Barker LR, Roca RP, Cole KA, Roter D, Golden AS.Kern DE, et al. Among authors: barker lr.J Gen Intern Med. 1989 Sep-Oct;4(5):421-31. doi: 10.1007/BF02599696.J Gen Intern Med. 1989.PMID: 2795266No abstract available.
Ratanawongsa N, Kern DE, Barker LR.Ratanawongsa N, et al. Among authors: barker lr.Med Educ. 2005 Nov;39(11):1165-6. doi: 10.1111/j.1365-2929.2005.02293.x.Med Educ. 2005.PMID: 16262841No abstract available.