Clinician survey.

One sample signed rank test.39 clinicians were sent the survey. There the numbers add up to less than 39, the question was not answered by all clinicians.单样本符号秩检验（One sample signed rank test）：共向39名临床医师发放了调查问卷，最终有效作答总数不足39，原因在于并非所有临床医师均回答了该问题。