How did serfdom differ in eastern and western europe?

In Western Europe serfdom had largely disappeared and in Eastern Europe, serfdom was firmly rooted

The Vietnam conflict is conventionally regarded as a watershed in our understanding of the psychological effects of trauma. In particular, it led to the introduction of a new diagnosis in psychiatry, post traumatic stress disorder (PTSD), and also to a new epidemic of disturbed, violent and neglected service personnel

Enough i think?