efficacia in other languages

• English
  

• Arabic
  

• Bulgarian
  

• Catalan
  

• Chinese
  

• Mandarin
  

• Czech
  

• Dutch
  

• Finnish
  

• French
  

• German
  

• Indonesian
  

• Interlingua
  

• Italian
  

• Japanese
  

• Portuguese
  

• Romanian
  

• Russian
  

• Slovak
  

• Spanish
  

• Swedish