Ever since I sent my abstract to you, I have looked forward to making an appointment with the hospital for a medical test. Today I received a notice from the hospital regarding my position on the waiting list. Unfortunately, the date of my appointment will coincide with the date at which I have to present my article at the conference. All I can do is offer my sincere apologies for not being able to attend itthe conference. I am deeply sorry for any inconvenience that this may cause.