Licson Lee says to YSITD https://www.google.com/url?sa=t&source=web&rct=j&url=https://en.m.wikipedia.org/wiki/Warfarin&ved=2ahUKEwjM9azywLjoAhVDPnAKHWf_CjkQmhMwCnoECBUQGQ&usg=AOvVaw0C4vV-S4eilyljrh-8n_qA