Search inside of Supercourse and lectures in HTML and PPT format
front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |review |
Because all these studies only looked at associations and because the conclusions drawn only from epidemiological evidence are unreliable due to confounding factors, one cannot be certain that these observations are causative. |