Dangling modifier

Which of the following sentences does NOT contain a dangling modifier?
Working efficiently, the manuscript was finished by a team of medical writers.
Having to go to her daughter’s recital, the operation was quickly completed by the surgeon.
Given our previous research results, we were able to plan the next study for optimum efficacy.
Before taking anti-emetic medications, the physician should caution the patient to check the dosage carefully.
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