PREOP-Gallstones: A Prognostic Nomogram for the Management of Symptomatic Cholelithiasis in Older Patients.
Parmar AD, Sheffield KM, Adhikari D, Davee RA, Vargas GM, Tamirisa NP, Kuo YF, Goodwin JS, Riall TS. PREOP-Gallstones: A Prognostic Nomogram for the Management of Symptomatic Cholelithiasis in Older Patients. Ann Surg. 2015 Jun; 261(6):1184-90.