"High-Density Lipoprotein Cholesterol, Size, Particle Number, and Residual Vascular Risk After Potent Statin Therapy" 
Circ Sep 3 (online)
http://circ.ahajournals.org/content/128/11/1189.abstract
"Conclusions—In the setting of potent statin therapy, HDL particle number may be a better marker of residual risk than chemically measured HDL-C or apoA-I. This has potential implications for evaluating novel therapies targeting HDL."