title: [On the value of the P wave--PQ segment ratio or Macruz index in the electrocardiograms of a group of welders].
mesh_terms: D000328:Adult; D006332:Cardiomegaly / Q000175:diagnosis*; D004562:Electrocardiography; D006325:Heart Atria; D006801:Humans; D008875:Middle Aged; D009784:Occupational Diseases / Q000175:diagnosis*; D014896:Welding
vernacular_title: Sul valore del rapporto onda P--segmento PQ o indice di Macruz in electtrocardiogrammi di un gruppo di saldatori