Author Contributions: Drs Brice, Ibáñez, Lesage, Lohmann, and Dürr had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: Ibáñez, Dürr, and Brice. Acquisition of data: Ibáñez, Lohmann, Dürr, Destee, Bonnet, Brefel-Courbon, and Agid. Analysis and interpretation of data: Ibáñez, Lesage, Janin, Durif, Heath, Zelenika, and Brice. Drafting of the manuscript: Ibáñez, Lesage, Janin, Lohmann, Bonnet, Zelenika, Agid, Dürr, and Brice. Critical revision of the manuscript for important intellectual content: Ibáñez, Lesage, Durif, Destee, Brefel-Courbon, Heath, Agid, Dürr, and Brice. Statistical analysis: Heath and Zelenika. Obtaining funding: Ibáñez, Durr, and Brice. Administrative, technical, and material support: Ibáñez, Lesage, Janin, Lohmann, Brefel-Courbon, Dürr, Zelenika, Agid, and Brice. Study supervision: Lesage, Durif, Destee, Durr, and Brice.