Question special

Greetings to all,
One of the inclusion criteria was being "eligible for pharmacologic thromboprophylaxis with UFH and LMWH". I am curious about what were the criteria the patients should meet before thromboprophylaxis was administered. I am curious if patients with high risk of bleeding e.g. acute ischemic stroke, history of variceal bleeding were excluded from the study. Also was there any difference on the bleeding rates in the study? Thanks in advance.