Table 1.

Center characteristics, responders vs nonresponders

	Respondents	Nonrespondents	Total	P-value
Location
Northern Italy	39 (27.3%)	29 (20.3%)	68 (47.6%)	0.002
Central-Southern Italy	23 (16.1%)	52 (36.3%)	75 (52.4%)
Total	62 (43.4%)	81 (56.6%)	143 (100%)
Institution type
IRCCS	30 (21%)	34 (23.7%)	64 (44.8%)	n.s.
University Hospital	13 (9.1%)	13 (9.1%)	26 (18.2%)
Community Hospital	19 (13.3%)	34 (23.7%)	53 (37.1%)
Total	62	81	143 (100%)

IRCCS, Istituto di Ricovero e Cura a Carattere Scientifico (Scientific Research Institute); n.s, nonsignificant.