3.DATA SOURCES? A computer-base search of Pubmed database published from January 1990 to December 2005 was performed by using the keywords "radio frequency? extremely low frequency? gene expression? immune system" with the language limited to English? which included the articles on the effect of RF emission and ELF electromagnetic radiation ?EMA? on the immune system.
资料来源:应用计算机检索Pubmed1990-01/2005-12有关射频辐射和极低频电磁辐射对免疫系统影响的文献,检索词“radiofrequency,extremelylowfrequency,geneexpression,immunesystem”,限定文章语言种类为English。