code: def generate_key(patient_id: str, study_id: str, series_id: str):
      return md5_digest(f"{patient_id}+{study_id}+{series_id}")
  
file_path: MONAILabel/monailabel/datastore/utils/dicom.py
imports: import logging
  import os
  import time
  from concurrent.futures import ThreadPoolExecutor
  from dicomweb_client import DICOMwebClient
  from pydicom.dataset import Dataset
  from pydicom.filereader import dcmread
  from monailabel.utils.others.generic import md5_digest, run_command
label_desc: Use image node_id 1 for calling a global function with example usage: generate_key(patient_id, study_id, series_id) and returns: md5_digest