code: @JsonProperty("participants")
      public List<String> getParticipantsNames() {
          if (participants == null)
              return null;
          List<String> participantList = new ArrayList<String>();
          for (ScheduleParticipant participant : participants)
              participantList.add(participant.getParticipant());
          return participantList;
      }
docs: Participants of schedule rotation
  
  @see ScheduleParticipant