Irianto, Komang Agung, and Marquee Kenny Tumbelaka. 2020. “A Case Series of Eight Scoliosis Patients Undergone Pedicle Screw Placement With Freehand Technique: Study for Safety and Accuracy”. Medical Journal of Indonesia 29 (2), 222-7. https://doi.org/10.13181/mji.cr.191978.