Following #1349, the function :

can be modified to improve code quality.

• Avoid unnecessary loops :
  

  clinica/clinica/iotools/converters/aibl_to_bids/utils/clinical.py

  Lines 182 to 185 in 48c12ab

  	for i in range(0, len(sessions_fields)):
  	if not pd.isnull(sessions_fields[i]):
  	fields_bids.append(sessions_fields_bids[i])
  	fields_dataset.append(sessions_fields[i])

• Write mapping functions instead of :
  

  clinica/clinica/iotools/converters/aibl_to_bids/utils/clinical.py

  Lines 218 to 221 in 48c12ab

  	dx_curren[dx_curren == -4] = "n/a"
  	dx_curren[dx_curren == 1] = "CN"
  	dx_curren[dx_curren == 2] = "MCI"
  	dx_curren[dx_curren == 3] = "AD"

• Use simpler handling for sessions identifiers

Utility functions used in it might be touched as well :

• Investigate for simpler handling of dates
• Handling of missing values