- Cancer Research 6
- Atmospheric Protection/Air Quality Control/Air Pollution 4
- Environment, general 4
- Ecotoxicology 3
- Environmental Chemistry 3
- Environmental Health 3
- Head and Neck Surgery 3
- Neurosurgery 3
- Otorhinolaryngology 3
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 3
- Biochemistry, general 2
- Cardiology 2
- Medical Biochemistry 2
- Oncology 2
- Aerospace Technology and Astronautics 1
- Catalysis 1
- Classical and Continuum Physics 1
- Climate Change/Climate Change Impacts 1
- Geography, general 1
- Hydrogeology 1