text: SELECT DISTINCT
   md5( cell_population_statistics.Filename ) as ParticipantID,
   1 as SequenceNum,
   cell_population_statistics.Panel,
   cell_population_statistics.Center,
   cell_population_statistics.Sample,
   cell_population_statistics.Replicate,
   cell_population_statistics.Filename
  FROM
   cell_population_statistics
  
  