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://123dok.co/document/q052v51v-폐암환자-증상관리를-위한-전화상담-가이드라인-개발-예비-성지현.html