Kidney Diseases/diagnosis; Mass Screening/methods; Urinalysis; Urinary Calculi/diagnosis; Urogenital Abnormalities/diagnosis; Adolescent; Asian People; Case-Control Studies; Chi-Square Distribution; Child; Child, Preschool; China; Chronic Disease; Early Diagnosis; Female; Food Contamination; Hematuria/diagnosis; Hematuria/diagnostic imaging; Humans; Hydronephrosis/diagnosis; Hydronephrosis/diagnostic imaging; Infant; Infant Formula; Infant, Newborn; Kidney Diseases/diagnostic imaging; Kidney Diseases/ethnology; Male; Odds Ratio; Predictive Value of Tests; Proteinuria/diagnosis; Proteinuria/diagnostic imaging; Risk Assessment; Risk Factors; Triazines/adverse effects; Ultrasonography; Urinary Calculi/chemically induced; Urinary Calculi/diagnostic imaging; Urinary Calculi/ethnology; Urogenital Abnormalities/diagnostic imaging; Urogenital Abnormalities/ethnology