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Steffen A, Frenzel H, Wollenberg B, König IR.Steffen A, et al. Among authors: frenzel h.Sleep Breath. 2015 Dec;19(4):1373-6. doi: 10.1007/s11325-015-1277-9. Epub 2015 Oct 19.Sleep Breath. 2015.PMID: 26483263
Steffen A, Wollenberg B, König IR, Frenzel H.Steffen A, et al. Among authors: frenzel h.J Plast Reconstr Aesthet Surg. 2010 Sep;63(9):1466-73. doi: 10.1016/j.bjps.2009.09.005. Epub 2009 Oct 3.J Plast Reconstr Aesthet Surg. 2010.PMID: 19801208
Steffen A, Klaiber S, Katzbach R, Nitsch S, König IR, Frenzel H.Steffen A, et al. Among authors: frenzel h.Aesthet Surg J. 2008 Jul-Aug;28(4):404-11. doi: 10.1016/j.asj.2008.06.003.Aesthet Surg J. 2008.PMID: 19083553
Steffen A, Meyer Zu Natrup C, König IR, Frenzel H, Rotter N.Steffen A, et al. Among authors: frenzel h.Laryngorhinootologie. 2009 Apr;88(4):247-52. doi: 10.1055/s-0028-1100386. Epub 2008 Dec 8.Laryngorhinootologie. 2009.PMID: 19065495German.
Steffen A, Frenzel H.Steffen A, et al. Among authors: frenzel h.HNO. 2014 Aug;62(8):560-3. doi: 10.1007/s00106-014-2894-5.HNO. 2014.PMID: 25099277German.No abstract available.