Correction: Hair cortisol concentrations in a Spanish sample of healthy adults

• Maria Angeles Garcia-Leon, 
• Maria Isabel Peralta-Ramirez, 
• Laura Arco-Garcia, 
• Borja Romero-Gonzalez, 
• Rafael A. Caparros-Gonzalez, 
• Noelia Saez-Sanz, 
• Ana Maria Santos-Ruiz, 
• Eva Montero-Lopez, 
• Andres Gonzalez, 
• Raquel Gonzalez-Perez