Concept explainers
(Exercises 19–26) For each description of data, identify Who and What were investigated and the Population of interest.
24. Blindness A study begun in 2011 examines the use of stem cells in treating two forms of blindness, Stargardt’s disease and dry age-related macular degeneration. Each of the 24 patients entered one of two separate trials in which embryonic stem cells were to be used to treat the condition. (www.blindness .org/index.php?view=article&id=2514:stem-cell-clinicaltrial- for-stargardt-disease-set-to-begin-&option=com_ content&Itemid=122)
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