| HPA | Health Care Practice Act; Health Policy Agenda for the American People; health promotion advocates; ... |
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| HPAA | hydroperoxyarachidonic acid; hydroxyphenylacetic acid; hypothalamo-pituitary-adrenal axis |
| HPAC | high-performance anion-exchange chromatography; hypothalamo-pituitary-adreno-cortical |
| hPFSH, HPFSH | human pituitary follicle-stimulating hormone |
| hPG, HPG | human pituitary gonadotropin |
| enlarged pituitary infundibulum | <radiology> Histiocytosis X, eosinophilic granuloma, Hand-Schuller-Christian disease, Letterer-Siwe disease, sarcoidosis (12 Dec 1998) |
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