Effects of normal as compared with low hematocrit values in patients with cardiac disease undergoing hemodialysis and receiving epoetin 

Serological study for Chagas disease in children younger than 10 years old from Valparaiso and San Antonio, Chile Estudio serológico para enfermedad de Chagas en menores de 10 años en Valparaíso y San Antonio, Chile 

Subacute combined degeneration of the spinal cord caused by vitamin B12 deficiency [1] Mielopatía por déficit de vitamina b12 en el bienio 2003-2005 

Premature birth and insulin resistance [3](multiple letters) 

Dr. Ruiz-Palacios and colleagues reply [5] 

Improving quality of care for severe malnutrition [2] (multiple letters) 

Molecular aspects of osteogenic phenomena Aspectos moleculares del fenómeno osteogénico 

Percutaneous valvuloplasty: a decade of continuous progress Valvuloplastía percutánea: una década de progreso continuo. 

Cellular basis of bone tissue development Bases celulares del desarrollo del tejido óseo 

Major histocompatibility system as a risk factor for alcoholic liver disease El sistema mayor de histocompatibilidad como factor de riesgo de la enfermedad hepática alcohólica.