1. 기본 정보
| 출처 | Centers for Disease Control and Prevention |
| 날짜 | 1970년 |
| 저작자 | Centers for Disease Control and Prevention |
| 저작권 | This image is a work of the Centers for Disease Control and Prevention, part of the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain. |