1 Pain and Palliative Care Research Unit, Oncology Department, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milano, Italy.
2 Mass Spectrometry Laboratory, Environmental Health Sciences Department, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milano, Italy. Electronic address: enrico.davoli@marionegri.it.
3 Molecular Biotechnology and Health Sciences Department, Universita' degli Studi di Torino, Torino, Italy.
4 Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Italy.
5 Center for Drug Regulatory Policies, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milano, Italy.
6 Experimental Psychopharmacology Laboratory, Department of Neuroscience, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milano, Italy.
7 Central Office of Drugs, Medical Devices and Pharmaceutical Service, Directorate, Ministry of Health, Rome, Italy.