sentences:  His later research suggested that the correlation may be due in part to a lack of vitamin D during the wintertime, after documenting that influenza A epidemics in temperate latitudes peak in the month following the winter solstice.His findings were based not only on observation in his practice, but also on extensive historical research into past epidemics.He received the Order of the British Empire, the Stuart prize from the British Medical Association, the Kuenssberg prize from the Royal College of General Practitioners, and an award from the International Society of Biometeorology.