(1.College of Nursing, Dali University, Dali, Yunnan 671000, China; 2.Clinical College, Dali University, Dali, Yunnan 671000, China;
3. Maternal and Child Care Service Centre of Dali Prefecture, Dali, Yunnan 671000, China; 4. Affiliated Hospital of Dali University,
Dali, Yunnan 671000, China)