{HEAD ~ Other workers} are investigating {TAIL ~ this compound} in connection with the pain and vomiting accompanying migraine 
{ HEAD ~ Other workers } are investigating { TAIL ~ this compound } in connection with the pain and vomiting accompanying migraine
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH