Rat khó chiu. Ho kinh khung . Sau khi mua va dùng g?i ch?ng trao ng??c 2 tuan e ?a K con bi ho n?a . Gi?m luon stree . Vi e hay bi strain l?m. Hien tai gio e thay rat t?t. Skhoe cung khá len rat nhieuag = ???  /  mg = ???? ???  /  µg ?? mcg = ????????  /  IU = ???? ??? ??????For Resmed devices it is measured in litres per 2nd - I believe.