They say: Why hath not an angel been sent down unto him? If We sent down an angel, then the matter would be judged; no further time would be allowed them (for reflection).
Times are computed by method; your mosque's timetable governs the adhan. Every text carries its source and grade. Nothing here is a fatwa, a prediction, or a substitute for a doctor: your own scholar decides what is contested, and the tradition itself says the practice is alongside treatment, never instead of it.