| COPD | Chronic Obstructive Pulmonary Disease |
| MBDA | Mental and Behavioral Disorders due to substance Abuse |
| AUD | Alcohol Use Disorder |
| SNHDD | Spanish National Hospital Discharge Database |
| HIV | Human Immunodeficiency Virus |
| ICU | Intensive Care Units |
| ICD-10-CM | International Classification of Diseases, 10th Revision, Clinical Modification |
| IHM | In-Hospital Mortality |
| OSA | Obstructive Sleeping Apnea |
| OAT | Opioid Agonist Treatment |
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