The opinions expressed do not necessarily represent the views of the American Academy of Family Physicians. This Web site does not define a standard of care, nor is it intended to dictate an exclusive course of management. It presents recognized methods of techniques of clinical practice for consideration by physicians for incorporation into their practices. Variations of practice taking into account the needs of the individual patient, resources, and limitations unique to the institution or type of practice may be appropriate. Disclosure about patient confidentiality, standards of care, or course of management does not imply endorsement or disapproval of products.