I have a paper that was recently accepted for a conference. I have already submitted the camera ready version and accepted the copyright terms etc. However, I now believe my design and results are not brilliant the more I look into it. This might invalidate the main claim and conclusion. Am I still allowed to prevent it from being included in the conference program and proceedings? I realize this is not a good situation given the time and effort spent by everyone involved in the review and administration process. But surely it is preferable to withdraw it before publication if you find issues with your paper? I would prefer to go back to the drawing board and resubmit at a later date with a stronger and reliable solution. If I want to withdraw it who should I contact?