Hi Nephrite,
I am not an expert as myself I am trying to get into clinical research but I find it very difficult.
My understanding is that the most accepted "entry-level" position for clinical research is CTA (clinical trials assistant/administrator/associate). Also, especially if your PhD involved a lot of data “Data analyst” can be an option.
Even for these positions sometimes experience is necessary but this depends on the company.
Hope that helps.
Chris