Table 2.

Laboratories involved in the study.

Center type and investigator		Hospital	Town and country	Laboratory details
Coordinator center
	Dr Murina	Ospedale Vittore Buzzi	Milano, Italy	The laboratory is inside the center, and the phase-contrast optical microscope is in the same room used for visits.
Satellite center
	Dr Inghirami	AIED, Via Gorizia	Roma, Italy	The laboratory is a private laboratory with extensive experience of collaboration with the lead investigator of the site.
	Dr Crișan	Clinica Medicală Dr Crișan Ciprian	Timisoara, Romania	The center is required to send the samples to a unique specialized laboratory (Bioclinica SA).
	Dr Biris	Clinica Medicală Dr Crișan Ciprian	Timisoara, Romania	The center is required to send the samples to a unique specialized laboratory (Bioclinica SA).
	Dr Sîrbu	Clinica Medicală Dr Sîrbu Daniela	Timisoara, Romania	The center is required to send the samples to a unique specialized laboratory (Bioclinica SA).