- Gayrettepe Florence Nightingale Hospital
- 2013-2014 Yonsei University Visiting Fellowship
- 2012-2013 Da Vinci off-site training as a console surgeon
- 1995-1996 Harvard Medical School, Massachusetts Eye and Ear İnfirmary
- 1993-1994 Darthmouth Hitchcock Medical Center
- 1985-1990 Şişli Etfal Eğitim Hastanesi
- 1977-1983 Ege Tıp Fakültesi
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• Turkish Ear Nose and Throat Association
• Facial Plastic Surgery Association
• Head and Neck Surgery Association
• Şenvar A, Aktan E, Çelikoyar M, Sarizi T: The role of ultrasonography in the evaluation of neck masses, Turkish Archives of Otolaryngology, 28: 234-237, 1990
• Çınar U, Demirbilek N, Çelikoyar M, Aktan E, Şenvar A: The role of H2 receptor antagonists in the treatment of otitis media with effusion. KBB Postası,3. 126-129(1994)
• Comparison of Amoxicillin and Ampicillin-Sulbactam in the treatment of acute maxillary sinusitis. Dalçık E, Özçelik HS, Aktan E, Özer MA, Çelikoyar M, Şenvar A.
• Comparison of Ampicillin-Sulbactam and Amoxicillin-Clavulonate in the treatment of acute tonsillitis and acute otitis media. Şenvar A, Aktan E, Şahin T.
• Our treatment policies in deep neck infections. Şenvar A, Aktan E, Şahin T, Demirbilek N. Submitted for the X th Annual Meeting of Medical Faculty of İstanbul University, sep 19-21,1989
• Importance of nasopharyngeal examination in metastatic carcinomas of the neck. Şenvar A, Aktan E, Demirbilek N, Özden A, Topaloğlu S. Proceeding of The National Turkih ORL Congress. 1989 Oct 9-13; Turkish Republic of Northern Cyprus. Turkish ORL Society, 19..
• Evaluation of the results of CWL Operation with gingivomucoperiosteal flap modification. Aktan E, Şenvar A, Proceedings of The XXI st National Turkish ORL Congress. 1991 Oct 5-12; Antalya, Turkey
• Our treatment modalities in epistaxis. Şenvar A, Değer K, Çelikoyar M, Aktan E. Turkish Archives of Otolaryngology 1988; 26 (3-4)
• Application of voice prosthesis in patients with total laryngectomy. Çelikoyar M, Aktan E. Curr Pract ORL 2018, 14(1): 27-37
• Construction of Bony-Cartilaginous Defects of the Nose. Çelik, Muzaffer; Aktan, Erkan.J Craniofac Surg ; 30(3): e234-e235, 2019.
• Essential Otolaryngology. Obstructive sleep apnea chapter, Aktan E, Çelikoyar M. Güneş bookstore, Istanbul, 2012.