Originally, 'sanatoriums' were specifically for tuberculosis treatment, a fact well-known in historical contexts. The old building on the hill was once a sanatorium for TB patients.
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Natural Environment
'Sanatorium' often implies a health facility in a peaceful, natural setting conducive to recovery. The fresh air at the mountain sanatorium aided her recuperation.
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Extended Stay
Patients typically have long-term stays in 'sanatoriums' compared to hospitals, focusing on gradual recovery. He spent several months in the sanatorium regaining his strength.