By DONALD G. McNEIL Jr.  POYAI, Thailand — Maikaew Panomyai did a little dance coming out of the examination room, switching her hips,        waving her fists in the air and crowing, in her limited English: “Everything’s O.K.! Everything’s O.K.!” Translation: The nurse just told me I do not have cervical cancer, and even the little white […]