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Intoxications involving the fentanyl analogs acetylfentanyl, 4-methoxybutyrfentanyl and furanylfentanyl: results from the Swedish STRIDA project.
Helander A, Bäckberg M, Beck O. Helander A, et al. Clin Toxicol (Phila). 2016;54(4):324-32. doi: 10.3109/15563650.2016.1139715. Epub 2016 Feb 5. Clin Toxicol (Phila). 2016. PMID: 26850293
Elevated brain 5-hydroxytryptophol levels in experimental portal-systemic encephalopathy.
Bergqvist PB, Some M, Apelqvist G, Helander A, Bengtsson F. Bergqvist PB, et al. Among authors: helander a. Pharmacol Toxicol. 1997 Apr;80(4):187-90. doi: 10.1111/j.1600-0773.1997.tb00394.x. Pharmacol Toxicol. 1997. PMID: 9140138
Presence of phenylethylamine in hallucinogenic Psilocybe mushroom: possible role in adverse reactions.
Beck O, Helander A, Karlson-Stiber C, Stephansson N. Beck O, et al. Among authors: helander a. J Anal Toxicol. 1998 Jan-Feb;22(1):45-9. doi: 10.1093/jat/22.1.45. J Anal Toxicol. 1998. PMID: 9491968
Comparison of urinary excretion characteristics of ethanol and ethyl glucuronide.
Dahl H, Stephanson N, Beck O, Helander A. Dahl H, et al. Among authors: helander a. J Anal Toxicol. 2002 May-Jun;26(4):201-4. doi: 10.1093/jat/26.4.201. J Anal Toxicol. 2002. PMID: 12054359
Comparison of HPLC and capillary electrophoresis for confirmatory testing of the alcohol misuse marker carbohydrate-deficient transferrin.
Helander A, Wielders JP, Te Stroet R, Bergström JP. Helander A, et al. Clin Chem. 2005 Aug;51(8):1528-31. doi: 10.1373/clinchem.2005.050732. Clin Chem. 2005. PMID: 16040850 No abstract available.
Development and clinical application of an LC-MS-MS method for mescaline in urine.
Björnstad K, Helander A, Beck O. Björnstad K, et al. Among authors: helander a. J Anal Toxicol. 2008 Apr;32(3):227-31. doi: 10.1093/jat/32.3.227. J Anal Toxicol. 2008. PMID: 18397574
Solid-phase extraction procedure for ethyl glucuronide in urine.
Zheng Y, Helander A. Zheng Y, et al. Among authors: helander a. J Anal Toxicol. 2008 Nov-Dec;32(9):778-81. doi: 10.1093/jat/32.9.778. J Anal Toxicol. 2008. PMID: 19021935
A multi-component LC-MS/MS method for detection of ten plant-derived psychoactive substances in urine.
Björnstad K, Beck O, Helander A. Björnstad K, et al. Among authors: helander a. J Chromatogr B Analyt Technol Biomed Life Sci. 2009 Apr 15;877(11-12):1162-8. doi: 10.1016/j.jchromb.2009.03.004. Epub 2009 Mar 11. J Chromatogr B Analyt Technol Biomed Life Sci. 2009. PMID: 19332394
Bioanalytical and clinical evaluation of 103 suspected cases of intoxications with psychoactive plant materials.
Björnstad K, Hultén P, Beck O, Helander A. Björnstad K, et al. Among authors: helander a. Clin Toxicol (Phila). 2009 Jul;47(6):566-72. doi: 10.1080/15563650903037181. Clin Toxicol (Phila). 2009. PMID: 19586355
Bioanalytical investigation of asarone in connection with Acorus calamus oil intoxications.
Björnstad K, Helander A, Hultén P, Beck O. Björnstad K, et al. Among authors: helander a. J Anal Toxicol. 2009 Nov-Dec;33(9):604-9. doi: 10.1093/jat/33.9.604. J Anal Toxicol. 2009. PMID: 20040135
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