| Abbreviations | Meaning |
 | ZO | Zichen-Oppenheim [syndrome]; Zonula Occludens; Zuelzer-Ogden [syndrome] |
| OPS | Operations; Optical Position Sensor; Osteoporosis-pseudolipoma Syndrome; Outpatient Service; Outpatient Surgery |
| SIDS | Sudden Infant Death Syndrome (SIDS Network) |
| STLS | Subacture Thyroiditis-like Syndrome |
| MERRLA | Myoclonus Epilepsy-ragged Red Fibers-lactic Acidosis [syndrome] |
| CAHS | Central Alveolar Hypoventilation Syndrome |
| PICFS | Postinfective Chronic Fatigue Syndrome |
| CFS | Cancer Family Syndrome |
| FXS | Fragile X Syndrome |
| MIDAS | Microphthalmia-dermal Aplasia-sclerocornea [syndrome] |
| AQMS | Acute Quadriplegic Myopathy Syndrome |
| MCS | Miles-Carpenter Syndrome |
| HLVS | Hypoplastic Left Ventricle Syndrome |
| WH | Well Hydrated; Werdnig-Hoffmann [syndrome]; Whole Homogenate; Wound Healing |
| PS-ZES | Pseudo-Zollinger-Ellison Syndrome |
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