Dr. Cheville will contact eligible patients by telephone after they receive a mailing describing the study and permitting them to opt out by returning a postage-paid postcard. A 'fold over' postcard will be sent so as to maintain the patient's privacy regarding lung or colon cancer diagnosis. Dr. Cheville's efforts to contact eligible patients will continue until 5 attempts have been made on different week days and times of day. Eligibility and inclusion and exclusion criteria will be assessed. If the patient is eligible, the study will be described in detail and verbal consent will be obtained from those desiring to participate. An informed consent form will be mailed to each patient willing to participate in the study to ensure that they have adequate opportunity to review the document. Informed consent will be obtained by Dr. Cheville when the patient comes to the Mayo Clinic for study enrollment. All questions will be answered prior obtaining informed consent.