“…CaP-coated samples produced using an organic (ORG) or inorganic (ING) sol were prepared by Dr. Lu Gan (University of Toronto, Canada) [17]. Metallographic grinding paper (Si-carbide, Buehler, Ltd., Lake Bluff, IL, USA) was used to surface finish the disks to a 600 grit (600G) roughened surface or a mirror-like finished surface (PL) on an Ecomet-5 polishing machine (Buehler, Ltd., Lake Bluff, IL, USA).…”