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| Methods | Randomized controlled trial |
| Participants | Patients undergoing elective surgery under general anaesthesia, 21 to 50 years of age, ASA I and II |
| Interventions | Granisetron 2 mg IV or magnesium sulfate 2.48 mmol or nitroglycerine 200 μg or normal saline before injection of propofol |
| Outcomes | Pain |
| Notes | Mail sent on 18th of January; reason for request was missing information about time point of assessment of nausea; no response received |
