The answers here published have been prepared by competent authorities. They do not, however, represent the opinions of any medical or other organization unless specifically so stated in the reply. Anonymous communications cannot be answered. Every letter must contain the wirter's name and address, but these will be omitted on request.
Questions and Answers. JAMA. 1961;176(11):967–974. doi:10.1001/jama.1961.03040240073025
Customize your JAMA Network experience by selecting one or more topics from the list below.
Create a personal account or sign in to: