Asemota AO, Gallia GL. Impact of frailty on short-term outcomes in patients undergoing transsphenoidal pituitary surgery. J Neurosurg. 2019;132(2):360–70.
Xu D, Fei M, Lai Y, Shen Y, Zhou J. Impact of frailty on inpatient outcomes in thyroid cancer surgery: 10-year results from the U.S. national inpatient sample. J Otolaryngol Head Neck Surg. 2020;49(1):51.
The Johns Hopkins ACG® System Excerpt from Version 11.0 Technical Reference Guide. Published online Nov 2014.