Abstract
This letter is in response to an article by the same title by Sander Greenland and Charles Poole.
Original language | English |
---|---|
Pages (from-to) | 335-335 |
Number of pages | 0 |
Journal | Epidemiology |
Volume | 6 |
Issue number | 3 |
Publication status | Published - May 1995 |
Keywords
- exposure variability
- zero-exposure categories