{HEAD ~ The zirconia particles} are prepared by a method that includes {TAIL ~ two separate hydrothermal treatments} 
{ HEAD ~ The zirconia particles } are prepared by a method that includes { TAIL ~ two separate hydrothermal treatments }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL