Singh Ospina N, Maraka S, Rodriguez-Gutierrez R, Espinosa de Ycaza AE, Jasim S, Gionfriddo M, Castaneda-Guarderas A, Brito JP, Al Nofal A, Erwin P, Wermers R, Montori V. Comparative efficacy of parathyroidectomy and active surveillance in patients with mild primary hyperparathyroidism: a systematic review and meta-analysis. Osteoporos Int. 2016 12; 27(12):3395-3407.