81. 4th Congress of the European ORL-HNS. Barcelona, Spain, October 7-11, 2017.

80. 36th Congress of the International Society of inflammation and Allergy of the Nose. Hong Kong, China, September 1-3, 2017.

79. 18th Rhinology World Congress. Hong Kong, China, September 1-3, 2017.

78. 21st World Congress of the International Federation of Otorhinolaryngological Societies. Paris, France, June 24-28, 2017.

77. IX International Symposium on Recent Advances in Rhinosinusitis & Nasal Polyposis. Kuala Lumpur, Malaysia, November 21-23, 2016.

76. 1st European Rhinology Research Forum. Brussels, Belgium, November 17-18, 2016.

75. 35th International Symposium on Infection & Allergy of the nose. Stockholm, Sweden, July 3-7, 2016.

74. 26th Congress of the European Rhinologic Society. Stockholm, Sweden, July 3-7, 2016.

73. 13th Congress of the European Society of Pediatric Otorhinolaryngology. Lisbon, Portugal, June 18-21, 2016.

72. OASSIS II, 2nd Oceanic-American Sinus/Skull Base Interactive Symposium. Atlanta GA, USA, May 5-7, 2016.

71. 7th International Symposium on Sentinel Node Biopsy in Head and Neck Cancer. Rome, Italy, April 8-9, 2016.

70. 54th Annual Meeting of the Japanese Rhinologic Society. Hiroshima, Japan, October 1-3, 2015.

69. 3rd Congress of European ORL-HNS. Prague, Czech Republic, June 7-11, 2015.

68. 33rd International Symposium on Infection & Allergy of the nose. Amsterdam, The Netherlands, June 22-26, 2014.

67. 25th Congress of the European Rhinologic Society. Amsterdam, The Netherlands, June 22-26, 2014.

66. XXXIII Congress of the European Academy of Allergy and Clinical Immunology. Copenhagen, Denmark, June 7-11, 2014.

65. VII International Symposium on recent advances in rhinosinusitis and nasal polyposis. Matsue, Japan, October 4-6, 2013.

64. 36th Annual Conference of the European Academy of Facial Plastic Surgery. Oslo, Norway, August 29-September 1, 2013.

63. 20th World Congress of the International Federation of Otorhinolaryngological Societies. Seoul, Korea, June 1-5, 2013.

62. 2nd International Symposium on Thoracic and Upper Aerodigestive Malignancies. Athens, Greece, April 4-6, 2013.

61. 31st International Symposium on Infection & Allergy of the nose. Toulouse, France, June 17-21 2012.

60. 24th Congress of the European Rhinologic Society. Toulouse, France, June 17-21 2012.

59. XXXΙ Congress of the European Academy of Allergy and Clinical Immunology. Geneva, Switzerland, June 16-20, 2012.

58. 30th International Symposium of Infection & Allergy of the Nose. Tokyo, Japan, September 20-23, 2011.

57. 14th Congress of the International Rhinologic Society. Tokyo, Japan, September 20-23, 2011.

56. 34th Annual Conference of the European Academy of Facial Plastic Surgery. Bruges, Belgium, September 1-4, 2011.

55. XXX Congress of the European Academy of Allergy and Clinical Immunology. Istanbul, Turkey, June 11-15, 2011.

54. 7th Aegean Meeting on Neurologic Therapeutics. Heraklio, Crete, Greece, May 27-28, 2011.

53. 29th International Symposium of Infection & Allergy of the Nose. Geneva, Switzerland, June 20-24, 2010.

52. 23rd Congress of the European Rhinologic Society. Geneva, Switzerland, June 20-24, 2010.

51. XXIX Congress of the European Academy of Allergy and Clinical Immunology. London, United Kingdom, June 5-9, 2010.

50. 5th Bodrum Rhinocamp. Bodrum, Turkey, May 26-30, 2010.

49. 1st Belgian Rhinologic Society Congress. Bruges, Belgium, April 23-24, 2010.

48. Annual Congress of the Royal Belgian Society of Ear Nose and Throat Head and Neck Surgery. Brussels, Belgium, November 20-21, 2009.

47. XXVIII Congress of the European Academy of Allergy and Clinical Immunology. Warsaw, Poland, June 6-10, 2009.

46. University of Pittsburgh Alumni Day. Allergy, Asthma and Sinus Update. Pittsburgh PA, USA, April 3-4, 2009.

45. Treatment Strategies for Upper Respiratory Disease: Managing the Disease/Treating the Symptoms. Berlin, Germany, January 16-18, 2009.

44. XIX World Congress of Asthma. Monte Carlo, Monaco, November 5-8, 2008.

43. American Academy of Otolaryngology – Head and Neck Surgery Annual Meeting. Chicago, IL, USA, September 21-24, 2008.

42. 32nd Annual Meeting of Japan Society for Aerosols in Medicine. Matsue, Shimane, Japan, September 4-6, 2008.

41.38th Annual Meeting of Japan Society for Infection in Otorhinolaryngology. Matsue, Shimane, Japan, September 4-6, 2008.

40. 8th International Conference on Pediatric Otorhinolaryngology. Budapest, Hungary, June 8-11, 2008.

39. 1st Scientific Meeting of the Pathophysiology of Allergic Diseases and modern Therapeutic Approaches. Constantinople, Turkey, May 16-18, 2008.

38. Belgian Rhinologic Society Inauguration. Bruges, Belgium, April 12, 2008.

37. The Face of Inflammation: Managing the Spectrum of Symptoms in Upper Respiratory Disease. Barcelona, Spain, January 19-20, 2008.

36. 12th Congress of the International Rhinologic Society. Venice, Italy, December 5-9, 2007.

35. American Academy of Otolaryngology – Head and Neck Surgery Annual Meeting. Washington DC, USA, September 16-19, 2007.

34. American Academy of Otolaryngic Allergy Annual Meeting. Washington DC, USA, September 13-16, 2007.

33. 6th European Congress of Otorhinolaryngology Head and Neck Surgery. Vienna, Austria, June 30th – July 4th, 2007.

32. Zur 78. Jahresversammlung der Deutschen Gesellschaft fur Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e. V. Munich, Germany, May 16-20, 2007.

31. Ελληνο-Κροατική Αλλεργιολογική Συνάντηση με θέμα: «Σύγχρονες αλλεργίες. Σύγχρονες θεραπείες». Dubrovnik, Croatia, April 13-15, 2007.

30. 25th International Symposium on Infection and Allergy of the Nose. Tampere, Finland, June 11-15, 2006.

29. 21st Congress of the European Rhinologic Society. Tampere, Finland, June 11-15, 2006.

28. Global Allergy Summit 2006. Allergy: Symptom control and beyond. Istanbul, Turkey, March 24-25, 2006.

27. The XVIIIth World Congress of The International Federation of Oto-Rhino-Laryngological Societies (IFOS). Rome, Italy 25-30 June, 2005.

26. American Academy of Otolaryngology – Head and Neck Surgery Annual Meeting, New York, New York, USA, September 19-22, 2004.

25. 5th European Congress of Otorhinolaryngology Head and Neck Surgery, Rhodes-Kos, Greece, September 11-16, 2004.

24. 23rd International Symposium on Infection and Allergy of the Nose. Istanbul, Turkey, June 18-25, 2004.

23. 20th Congress of the European Rhinologic Society. Istanbul, Turkey, June 18-25, 2004.

22. 6th International Conference on Pediatric Otorhinolaryngology. Athens, Greece, May 16-19, 2004.

21. 4η Κοινή Συνάντηση Ελληνικής και Τουρκικής Εταιρείας Ωτορινολαρυγγολογίας – Χειρουργικής Κεφαλής και Τραχήλου. Θεσσαλονίκη, 8-12 Οκτωβρίου 2003.

20. ILLA / LTL ‘2003 International Conference and Symposium in Laser Technology and Lasers. Plovdiv, Bulgaria, September 27 – October 1, 2003.

19. 1st Mediterranean Melanoma Meeting, Mediterranean Sea Aegean, 2-5 May 2003.

18. Vertigo meeting. International Meeting in Otology and Neuro Otology. Stara Zagora-Zheravna, Bulgaria, May 15-18, 2003.

17. The XVIIth World Congress of The International Federation of Oto-Rhino-Laryngological Societies (IFOS). Cairo, Egypt 28th Sept-3 Oct., 2002.

16. Symposium 2002, Preoperative Management of the High Risk Patient, Heraklio, May 10-12, 2002.

15. Joint Meeting of the American Academy of Otolaryngology – Head and Neck Surgery, and of the Panhellenic Society of Otorhinolaryngology – Head and Neck Surgery. Athens, June 20-23, 2001.

14. 2nd World Congress of Otolaryngologic Allergy Endoscopy and Laser Surgery. Athens, June 20-23, 2001.

13. Millenium International Workshop on Biological Effects of Electromagnetic Fields. Heraklio, October 17-20, 2000.

12. 19th International Conference of Young Otolaryngologists, St. Petersburg, Russia, June 19-21, 2000.

11. Zur 71. Jahresversammlung der Deutschen Gesellschaft fur Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie e. V. Berlin, Germany, May 13-18, 2000.

10. 4th European Congress of Otorhinolaryngology Head and Neck Surgery, Berlin, Germany, May 13-18, 2000.

9. 50th Anniversary Extraordinary Congress of Spanish Society of Otolaryngology-Head and Neck Surgery, Madrid, Spain, October 24-27, 1999.

8. American Academy of Otolaryngology – Head and Neck Surgery Annual Meeting, New Orleans, Lousiana, USA, September 26-29, 1999.

7. 2nd Euroconference on Cell Dynamics. Heraklio, October 24-28, 1998.

6. 1st World Congress of Otolaryngologic Allergy, Endoscopy and Laser Surgery. Athens, June 24-27, 1998.

5. 3rd Congress of the European Federation of Otorhinolaryngological Societies (EUFOS). Budapest, Hungary, June 9-14, 1996.

4. 2nd European Congress of Medical Students. Thessaloniki, Greece, May 3-5, 1996.

3. Cancer of the Oral cavity: Comprehensive Approach. Pittsburgh USA, October 19, 1994.

2. Otolaryngology Alumni Teaching Day. Pittsburgh USA, April 29, 1994.

1. 1st Mediterranean Medical Meeting. Heraklio, Crete, September 24-28, 1989.