• Food and Drugs Administration

• Hospital Virtual (USA)

• PubMied

• CNN Health

• The Nephron Information Center

• Revistas de Medicina Gratuitas on-line

• Respirar

• American Academy of Allergy, Asthma & Immunology

• American College of Chest Physicians

• American Thoracic Society

• European Academy of Allergy & Clinical Immunology

• Sociedad Brasileira de Alergia & Imunopatología

• Sociedad Española de Alergología e Inmunología Clínica

• Sociedad Sudafricana de Alergia

• Texas Allergy & Immunology Society

• Universidad de León, España

• CDC Center for Disease Control

• Instituto Pasteur

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