{TAIL ~ The above mentioned spherical agglomerates} of {HEAD ~ hydroxyapatite microparticles} will be referred to hereinafter simply as the HAP sphere 
{ TAIL ~ The above mentioned spherical agglomerates } of { HEAD ~ hydroxyapatite microparticles } will be referred to hereinafter simply as the HAP sphere
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH