Table 5.

Regional distributions of publications

Country	the USA						China
Period Num.	2008–2017 1031		2008–2012 269		2013–2017 762		2008–2017 173		2008–2012 38		2013–2017 135
Rank	Region	Num.	Region	Num.	Region	Num.	Region	Num.	Region	Num.	Region	Num.
1	Massachusetts	211	New York	45	Massachusetts	169	Taiwan	47	Taiwan	15	Beijing	38
2	New York	173	Massachusetts	42	California	129	Beijing	46	Beijing	8	Taiwan	32
3	California	161	Minnesota	37	New York	128	Guangdong	22	Hong Kong	3	Guangdong	21
4	Minnesota	122	Tennessee	36	Minnesota	85	Shanghai	17	Sichuan	3	Shanghai	16
5	Tennessee	102	California	32	Pennsylvania	81	Zhejiang	16	Zhejiang	3	Zhejiang	13
6	Pennsylvania	98	Utah	27	Texas	68	Jiangsu	11	Heilongjiang	2	Jiangsu	10
7	Utah	90	Maryland	17	Tennessee	66	Heilongjiang	9	Macau	2	Hubei	8
8	Maryland	81	Pennsylvania	17	Maryland	64	Hubei	8	Chongqing	1	Heilongjiang	7
9	Texas	78	Washington	16	Utah	63	Chongqing	7	Gansu	1	Chongqing	6
10	Washington	72	Indiana	14	Washington	56	Sichuan	7	Guangdong	1	Henan	5
11	Illinois	51	Wisconsin	13	Ohio	42	Hong Kong	6	Jiangsu	1	Macau	4
12	Indiana	45	Illinois	11	Illinois	40	Macau	6	Shaanxi	1	Sichuan	4
13	Ohio	45	Florida	10	Indiana	31	Henan	5	Shandong	1	Hong Kong	3
14	Michigan	38	Michigan	10	Michigan	28	Shaanxi	4	Shanghai	1	Jilin	3