From: Biodistribution, biocompatibility and targeted accumulation of magnetic nanoporous silica nanoparticles as drug carrier in orthopedics
Cluster size
Quantity
None (0)
Occasional (1–5)
Few (≤ 20)
Many (≤ 100)
Plentiful (≥ 100)
Very small
0
1
2
3
5
Small
4
6
Medium
7
Large
8
Very large
9