并列题名：Study of the utilization of health services for migrant population and the influencing factors Study of the utilization of health services for migrant population and the influencing factors 并列题名：Study of the only-child family relationship and its influencing factors 并列题名：Study on the measurement of Chinese consumer ethical behavior and its influencing factors 并列题名：Study on the characteristics of Chinese farmers' information need and its influencing factors 并列题名：Study on the national communicative psychology and its influential factors