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Holroyd KA, Penzien DB, Cordingley GE.Holroyd KA, et al. Among authors: penzien db.Headache. 1991 May;31(5):333-40. doi: 10.1111/j.1526-4610.1991.hed3105333.x.Headache. 1991.PMID: 1830566Clinical Trial.
Martin NJ, Holroyd KA, Penzien DB.Martin NJ, et al. Among authors: penzien db.Headache. 1990 Nov;30(11):729-34. doi: 10.1111/j.1526-4610.1990.hed3011729.x.Headache. 1990.PMID: 2074167
Holroyd KA, Penzien DB.Holroyd KA, et al. Among authors: penzien db.Pain. 1990 Jul;42(1):1-13. doi: 10.1016/0304-3959(90)91085-W.Pain. 1990.PMID: 2146583Clinical Trial.
Holroyd KA, Penzien DB.Holroyd KA, et al. Among authors: penzien db.Pain. 1989 Dec;39(3):359-361. doi: 10.1016/0304-3959(89)90050-X.Pain. 1989.PMID: 2616186No abstract available.
Holm JE, Holroyd KA, Hursey KG, Penzien DB.Holm JE, et al. Among authors: penzien db.Headache. 1986 Apr;26(4):160-7. doi: 10.1111/j.1526-4610.1986.hed2604160.x.Headache. 1986.PMID: 3710769No abstract available.