Region | Province | Hospital | Study period | Number of cases |
---|---|---|---|---|
North | Beijing | Beijing Children’s Hospital | 2012–2017 | 164 |
 | Hebei | Hebei Children’s Hospital | 2012–2017 | 158 |
 | Hebei | Baoding Children’s Hospital | 2012–2017 | 27 |
 | Inner Mongolia | Maternal and Child Health Care Hospital of Inner Mongolia | 2014–2017 | 10 |
 | Shanxi | Children's Hospital of Shanxi | 2015–2017 | 9 |
East | Jiangxi | Jiangxi Provincial Children’s Hospital | 2012–2017 | 63 |
 | Jiangsu | Nanjing Children’s Hospital Affiliated to Nanjing Medical University | 2012–2017 | 44 |
 | Zhejiang | Hangzhou Children’s Hospital | 2012–2017 | 22 |
 | Shandong | Children's Hospital of Jinan | 2014–2017 | 32 |
South | Guangdong | Shenzhen Children’s Hospital | 2012–2017 | 97 |
 | Hunan | Hunan Children's Hospital | 2014–2017 | 28 |
 | Henan | Children's Hospital Affiliated to Zhengzhou University | 2015–2017 | 112 |
Northwest | Xinjiang | Urumqi Children’s Hospital | 2012–2017 | 15 |
 | Shaanxi | Xi’an Children’s Hospital | 2015–2017 | 25 |