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  1. Acute sinusitis - Symptoms and causes - Mayo Clinic

  2. Chronic sinusitis - Symptoms and causes - Mayo Clinic

  3. Sinus Infection (Sinusitis): Causes, Symptoms & Treatment

  4. Sinus Infection: Symptoms, Causes, and Treatment - Healthline

  5. Nasennebenhöhlenentzündung: Definition, Therapie

  6. Sinusitis (sinus infection) - NHS

  7. Sinus Infection (Sinusitis): Symptoms, Causes, Duration, and

  8. Sinusitis: Symptoms, Risk Factors, Treatment, and More - Healthline

  9. Sinus infection: 11 symptoms and treatments - Medical News …

  10. Acute sinusitis - Diagnosis and treatment - Mayo Clinic