These guidelines are based on the best available evidence and expert opinion, and are intended to optimize patterns of clinical practice. They are not to be prescriptive or replace clinical judgement, nor restrict innovation. Healthcare professionals must always consider the needs, preferences, values, financial and personal circumstances of individual patients and work within the realities of their healthcare setting. Inequities in staffing, financial, equipment, and healthcare resources in different jurisdictions may impact upon physician and patient options and decisions. As the general nature of guidelines cannot provide individualized guidance for all patients in all circumstances, this document should not be used as a legal resource.