Research objects and location Research subjects include nurses working at 15 district hospitals in 14 districts of Hai Phong city, including 7 district town hospitals: Le Chan, Hong Bang, Ngo Quyen, Hai An, Duong Kinh, Do Son, Kien An; and 8 district hospitals: Kien Thuy, Tien Lang, Vinh Bao, An Duong, Thuy Nguyen, Cat Ba, Cat Hai and An Lao * Criteria for selection: - Having a nursing degree - Having worked at the hospital for at least 9 months (this time to ensure the assessment of employees affected by the working environment). - Agree to participate in the research * Exclusion criteria: - Nurses work in hospitals for less than 9 months - Refuse to participate in this study - Are attending school or absent from work at the time of research 2.1.2.