medicine
(
4
)
transplantation
(
4
)
cardiology
(
3
)
heart
(
3
)
heart -- transplantation
(
3
)
heart transplantation
(
3
)
medicine & public health
(
3
)
surgery
(
3
)
air
(
2
)
air contaminants
(
2
)
air pollutants
(
2
)
air pollution
(
2
)
air pollution control
(
2
)
air quality
(
2
)
air toxics
(
2
)
airborne pollutants
(
2
)
aire
(
2
)
atmosphere
(
2
)
atmospheric deposition
(
2
)
contaminants, air
(
2
)
control
(
2
)
control of air pollution
(
2
)
heart, artificial
(
2
)
heart-lung transplantation
(
2
)
heart-transplantation
(
2
)
lung transplantation
(
2
)
lungs
(
2
)
lungs -- transplantation
(
2
)
pollutants, air
(
2
)
pollution
(
2
)