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Mathematics, 04.07.2020 19:01 alleshia2007

Between January and June 1998, parents of children aged 2-16 years [...] that were seen as outpatients in a university pediatric ophthalmology clinic completed a questionnaire on the child's light exposure both at present and before the age of 2 years. Was this study observational, or was it a controlled experiment? Explain.

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