3.1 selection criteria selection criteria 3.1.1
1) is a primary school student in school, medium city district, Nong Khai
. 2). Age 6-12 years
3) allowing cooperation in research
4). Parents cooperate in research
3.1.2 criteria eliminated
1). Students quit or move to another study
2). Parents do not cooperate
3). Patients withdrawal
.
การแปล กรุณารอสักครู่..
