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Subjects
- Vaccination2
- Warfare2
- Balkan Peninsula1
- Bone Transplantation1
- Bulgaria1
- California1
- Climate1
- Ecosystem1
- Fractures, Bone -- surgery1
- History, 20th Century1
- Hydrotherapy1
- Influenza, Human1
- Influenza, Human -- prevention & control1
- Mental Disorders1
- Military Personnel1
- Pneumonia, Viral -- prevention & control1
- Respiratory Tract Infections -- prevention & control1
- Sexually Transmitted Diseases1
- Shock1
- Shock, Surgical1