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SAD
Salpingo-oophorectomy
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Sexual health clinics
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Sick building syndrome
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SIDS
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Sinusitis
Sjogren's syndrome
Skin cancer (melanoma)
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Small bowel transplant
Smear test
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Soft tissue sarcoma
Solvent abuse
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Spastic paraplegia - hereditary
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SSRIs (selective serotonin reuptake inhibitors)
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Syringomyelia
Systemic lupus erythematosus