People should know the causes of their asthma symptoms and try to avoid these triggers.

VOA: special.2009.07.28

These have all been identified as possible causes of the collapse disorder.

VOA: special.2009.09.22

These are common causes of accidental poisoning.

VOA: special.2009.08.11

Our inability to prevent weapons from being illegally smuggled across the border to arm these criminals causes the death of police officers, soldiers and civilians.

VOA: standard.2009.03.25

But Tilford says these are symptoms and not the root causes of Greece's dilemma.

VOA: standard.2010.02.26

And without a vaccine, Dr.Fauci says the best methods of prevention are these: encourage people to limit the numbers of sexual partners encourage men to use condoms train more doctors to perform adult male circumcision empower women to choose their sex partners and protect themselves from getting the virus that causes AIDS All of these goals still remain major challenges.

VOA: standard.2010.07.17