Annals of Saudi Medicine · 2016 · 11 citations · 10 references
Relatively small sample size. The study was in a single outpatient clinic. Recall bias in the number of hospital admissions in the last ten years.
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Distribution of Sickle-cell Hæmoglobin in Saudi Arabia
H. Lehmann, G. MARANJIAN, A. E. Mourant · Nature · 1963 · 100 citations