Vitamin D and Its Metabolites Quantification in Adipose Tissues of Obese and Non-obese Patients.

Subcutaneous and visceral adipose tissue biopsies during operation

"Blood sampling is required to measure plasma cholecalciferol, calcidiol and calcitriol concentrations, as well as biological parameters of interest.~Another plasma/serum tube is used to measure pro- and anti-inflammatory cytokines and adiponectin."