| Abbreviations | Meaning |
 | PS | Periodic Syndrome |
| PEHO | Progressive Encephalopathy-edema-hypsarrhythmia-optic Atrophy [syndrome] |
| MDS/MPS | Myelodysplastic/myelproliferative Syndromes |
| BLS | Blind Loop Syndrome |
| MCS | Malignant Carcinoid Syndrome |
| LAS | Lymphadenopathy Syndrome |
| AAA | Abdominal Aortic Aneurysm/aneurysmectomy; Acne-associated Arthritis; Acquired Aplastic Anemia; Acute Anxiety Attack; Alacrimia-achalasia-addisonianism [syndrome] |
| THS | Teebe Hypertelorism Syndrome; Tetrahydro-compound S; Thrombohemorrhagic Syndrome; Tolosa-Hunt Syndrome; Tromso Study; Turkish Heart Study |
| FPS | Fetal PCB (polychlorinated Biphenyl) Syndrome |
| NPA | Nail-patella [syndrome] |
| FMR | Fragile Site Mental Retardation [syndrome]; Friend-Moloney-Rauscher [antigen] |
| LFS | Lateral Facet Syndrome; Latest Finishing Shift; Li-Fraumeni Syndrome; Limbic Forebrain Structure; Liver Function Series |
| AIDSLINE | On-line Information On Acquired Immunodeficiency Syndrome [MEDLARS Data Base] |
| VAS | Viral Arthritis Syndrome |
| DPS | Dysesthetic Pain Syndrome |
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