Corbett M F, Herxheimer A, Magnus I A, Ramsay C A, Kobza-Black A
Br J Dermatol. 1977 Dec;97(6):655-62. doi: 10.1111/j.1365-2133.1977.tb14273.x.
The efficacy of oral beta-carotene for the prevention of photosensitivity symptoms in erythropoietic protoporphyria was studied in a controlled cross-over trial in which it was compared with a placebo. No significant difference was found between the 2 preparations. Patients' symptoms showed statistically significant association with sunlight hour records.
在一项对照交叉试验中，研究了口服β-胡萝卜素预防红细胞生成性原卟啉症光敏症状的疗效，并与安慰剂进行了比较。两种制剂之间未发现显著差异。患者症状与日照时长记录显示出统计学上的显著关联。
