Ara mostrant els elements 1-10 d 1

    Environment and Public Health (1)
    Environment and Public Health::Public Health (1)
    Environment and Public Health::Public Health::Disease Transmission, Infectious (1)
    Health Care Facilities, Manpower, and Services (1)
    Health Care Facilities, Manpower, and Services::Health Services (1)
    Health Care Facilities, Manpower, and Services::Health Services::Preventive Health Services (1)
    Health Care Facilities, Manpower, and Services::Health Services::Preventive Health Services::Needle-Exchange Programs (1)
    Other subheadings (1)
    Other subheadings::Other subheadings (1)
    Other subheadings::Other subheadings::/prevention & control (1)