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A psychiatric study of nonorganic chronic headache patients.
Okasha A, Ismail MK, Khalil AH, el Fiki R, Soliman A, Okasha T. Okasha A, et al. Among authors: el fiki r. Psychosomatics. 1999 May-Jun;40(3):233-8. doi: 10.1016/S0033-3182(99)71240-5. Psychosomatics. 1999. PMID: 10341536