Total Hip Arthroplasty or Hemiarthroplasty for Displaced Femoral Neck Fractures?: Commentary on an article by Mina Tohidi, MD, FRCS(C), PhD, et al.: "Comparative Effectiveness of Total Hip Arthroplasty and Hemiarthroplasty for Femoral Neck Fracture. A Propensity-Score-Matched Cohort Study".