Applying negative ions and an electric field to countermeasure droplets/aerosol transmission without hindering communication oleh Kaito Kanda, Hisaaki Nishimura, Takuya Koiso, Kousuke Takemoto, Kazuma Nakagoe, Tetsuya Yamada, Masaharu Takahashi, Mariko Hanafusa, Tomoki Kawahara, Yasuko Yanagida, Jin Kuramochi, Takeo Fujiwara