Classification
614 - Incidence & prevention of disease
34
613 - Personal health & safety
33
610 - Medicine & health
5
003 - Systems
3
616 - Diseases
3
300 - Social sciences
1
353 - Specific fields of public administration
1
362 - Social welfare problems & services
1
615 - Pharmacology & therapeutics
1
620 - Engineering & allied operations
1
660 - Chemical engineering
1