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://9lib.co/document/qmj8l3n9-手術前疼痛衛教對改善脊椎術後病人疼痛經驗之成效探討.html