医患关系；医疗纠纷；防御性医疗行为。
Doctor-patient Relationship; Medical disputes; Defensive medicine.
防御性医疗的直接成因是对医疗风险责任的恐惧。
The direct cause of its formation is fear of the liability of medical risk.
第三，防御性医疗行为降低了乳腺癌临床决策的质量；
Thirdly, defensive medicine depresses the quality assurance of clinical decision.
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