健康轉型期（ health transition ）或流行病學轉型（ epidemiological transition ）包含四個階段：①大流行及飢荒期（ the age of pestilence and famine ） ②流行減退期（ the age of receding pandemics ） ③延後退化期（ the age of delayed degenerative diseases ）④退化及人為疾病期（ the age of degenerative and man-made diseases ）。其先後順序何者正確？