The suicide rate among such patients is very high, he said.
This route is common among patients over 70 years old.
That estimate rose to 60 percent among patients under 30 years old.
The researchers found that the death rate among patients receiving the treatment was 33 percent lower.
The effect was most pronounced among patients younger than 69, the study said.
This is less likely among patients who are diagnosed at an early stage.
Also popular among patients is the center's policy of sending women home between 5 and 12 hours after they give birth.
Sometimes when his supplies got low, he would divide up what was left among patients.
The risk of suicide among patients given the pills is small.
Studies have found 25 percent fewer deaths among patients who received this drug.