Had conversation with the chairman before starting the presentation in the 2023 annual session of the American Association of Orthodontists at Chicago, USA.

Dr. Yen gave an academic presentation at the 2023 American Association of Orthodontists annual meeting in Chicago, USA.

Dr. Yeong-charng Yen gave an academic presentation at the 2023 annual session of American Association of Orthodontists in Chicago, USA.

Dr. Yeong-charng Yen gave an academic presentation at the 2023 annual session of American Association of Orthodontists in Chicago, USA.

Had photo picture together with my wife Mrs. Yen, TAO President, Dr. Cheng, Dr. Liaw, Former WFO President, Dr. & Mrs. Justus and other friends in the meeting hall.

The certificate of Dr. Yen’s presentation in the 2023 AAO annual session at Chicago, USA.

	The nametag of the 2023 annual session of the American Association of Orthodontists
	Had presentation in the 2017 annual session of American Association of Orthodontists at San Diego, USA.

Had presentation in the 2012 annual session of American Association of Orthodontists at the Honolulu, Hawaii, USA.