Ide lain dari Denny Rizaldi
Atlas of Transnasal Esophagoscopy by Gregory N. Postma, http://www.amazon.com/dp/0781751802/ref=cm_sw_r_pi_dp_lEWTrb1SWH9VS

Atlas of Transnasal Esophagoscopy by Gregory N. Postma, http://www.amazon.com/dp/0781751802/ref=cm_sw_r_pi_dp_lEWTrb1SWH9VS