Earlier clinical studies comparing the masks and respirators yielded mixed results, said Dr. Perl, also a Professor of Internal Medicine who holds the Jay P. Sanford Professorship in Infectious Diseases.
Perl 博士说,早期比较口罩和呼吸器的临床研究得出了不同的结果,Perl 博士也是一名内科教授,拥有 Jay P. Sanford 传染病教授职位。