public static Cohort GetGroupById(string accessToken, string id)
 {
     var cs = new CohortService(accessToken.ToString());
     var result = cs.GetById(id);
     return result.Result;
 }
 public static async Task<Cohort> GetCohortById(string accessToken, string id)
 {
     var cs = new CohortService(accessToken.ToString());
     var result = await cs.GetById(id);
     return result;
 }