Dear Partners,

contrary to what happens in retrospective studies in which all laboratory data are collected without considering the techniques used in the various laboratories, the randomized clinical study, which is prospective, can make it possible to homogenize the approach to laboratory techniques for a more correct statistical analysis of the data. Therefore, I kindly ask you to obtain information from the chemical-clinical analysis laboratory on the four required dosages, by filling in the enclosed questionnaire. Thanks for your cooperation and best regards

F.P. Schena