This practice guideline is not intended to be construed or to serve as a standard of medical care. Standards of medical care are determined on the basis of all clinical data available for an individual case and are subject to change as scientific knowledge and technology advance and patterns evolve. These parameters of practice should be considered guidelines only. Adherence to them will not ensure a successful outcome in every case, nor should they be construed as including all proper methods of care or excluding other acceptable methods of care aimed at the same results. The practitioner, in light of the clinical data presented by the patient and the diagnostic and treatment options available, must make the ultimate judgment regarding a particular clinical procedure or treatment plan.