title: How to do random allocation (randomization).
abstract: OBJECTIVE
  To explain the concept and procedure of random allocation as used in a randomized controlled study.
  
  
  METHODS
  We explain the general concept of random allocation and demonstrate how to perform the procedure easily and how to report it in a paper.
authors.affiliation: Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, Seoul, Korea.
authors.forename: Jeehyoung
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Orthopedic Surgery, Seoul Sacred Heart General Hospital, Seoul, Korea.
authors.forename: Wonshik
authors.initials: W
authors.lastname: Shin
mesh_terms: D006801:Humans; D011897:Random Allocation; D016032:Randomized Controlled Trials as Topic / Q000379:methods*
keywords: Block randomization; Random allocation; Simple randomization; Stratified randomization