When and by whom was the curved tip of a gum-elastic bougie first introduced.

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@article{Toyoyama2002WhenAB, title={When and by whom was the curved tip of a gum-elastic bougie first introduced.}, author={Hirokatsu Toyoyama and Yuki Hirose and Yoshiko Toyoda}, journal={Anaesthesia}, year={2002}, volume={57 9}, pages={932} }