End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
https://123deta.com/document/y4gk3x9y-事前調査の結果研究員所属校の児童生徒を対象にアンケト調査を実施しがんに対するイメジや知識などについて.html