Kolasińska, Marzena, et al. “Evaluation of the Capacity of Patients With Pathological Obesity, in a Six-Minutes March Test, before and After Laparoscopic Sleeve Gastrectomy”. Journal of Education, Health and Sport, vol. 10, no. 9, Sept. 2020, pp. 92-102, doi:10.12775/JEHS.2020.10.09.010.