[1] Catholic Univ Korea, Seoul St Marys Hosp, Coll Med, Dept Neurosurg, 222 Banpo Daero, Seoul 06591, South Korea
[2] Queen Savang Vadhana Mem Hosp, Dept Orthoped, Thai Red Cross Soc, Sriracha, Thailand
[3] Hosp Privado Rosario, Latinamerican Endoscop Spine Surg Soc LESSS 2, Rosario, Argentina
[4] Chang Gung Mem Hosp, Dept Neurosurg, Chiayi, Taiwan
[5] Seoul Top Spine Hosp, Dept Neurosurg, Goyangsi, South Korea
[6] Pohang Woori Hosp, Dept Spine Surg, Pohang, South Korea
[7] Wooridul Spine Hosp, Dept Neurosurg, Seoul, South Korea
[8] Hosp H, Brain & Spine Care Minimally Invas Spine Surg Grp, Queretaro City, Mexico
[9] Univ La Frontera, Hosp Hernan Henriquez Aravena, Dept Orthoped Surg, Temuco, Chile
[10] Cirurgia Minimamente Invas & Endoscopia Coluna, Dept Orthoped Surg, Belo Horizonte, Brazil
[11] Chulalongkorn Univ, King Chulalongkorn Mem Hosp, Fac Med, Dept Orthoped, Bangkok 10330, Thailand