1) Identify the type of observational study (cross-sectional, retrospective, or prospective) and explain the reason for your selection: A group of physicians studied New York City residents with and without respiratory problems. They went back in time to determine how involved they were in the New York City terrorist attacks on September 11, 2001.

1) Identify the type of observational study (cross-sectional, retrospective, or prospective) and explain the reason for your selection: A group of physicians studied New York City residents with and without respiratory problems. They went back in time to determine how involved they were in the New York City terrorist attacks on September 11, 2001.

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