Methods: Clinical observation on change of zinc in serum of 186 cases were adopted with methods of random, singleblind, parallel and control study of positive medicine.
方法:采用随机、单盲、阳性药平行对照方法对186例患者治疗前后血清锌的变化进行临床观察。
3
DESIGN: Randomized, singleblind and placebo control prospective study based on patients.