| Evidence classification method： |
The recommendations in this guideline are divided into five levels according to the strength of evidence-based medicine: A strong recommendation, positive evidence, can improve health outcomes, and the benefits outweigh the risks; B recommendation, which is well documented to improve health outcomes and does more good than harm; C Not recommended or routinely recommended, with evidence of improved health outcomes but with nearly equal benefits; D against recommendation because the evidence is not strong or would cause more harm than good to health outcomes; I Evidence is lacking, or of poor quality, or contradictory to determine the benefits and harms of health outcomes |
