Looking on the internet deeply has found these results:

second leading is the most popular phrase on the web.

second-leading 13,060,000 results on the web	second leading 13,380,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	TB is a significant global health concern and is the second leading cause of death from infectious disease worldwide. olds. It is quite right that TB is a significant global health concern and, as we know, is the second leading cause of death from infectious diseases worldwide. I hear locomotive smoke is the second leading cause of death among train aficionados. year Diabetes is becoming the second leading cause of mortality from hypertension. Since its more than four years of existence, the euro has become the world's second leading currency. Suicide is the second leading cause of death for 15 to 25

second-leading

13,060,000 results on the web

second leading

13,380,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

TB is a significant global health concern and is the second leading cause of death from infectious disease worldwide.
olds.
It is quite right that TB is a significant global health concern and, as we know, is the second leading cause of death from infectious diseases worldwide.
I hear locomotive smoke is the second leading cause of death among train aficionados.
year
Diabetes is becoming the second leading cause of mortality from hypertension.
Since its more than four years of existence, the euro has become the world's second leading currency.
Suicide is the second leading cause of death for 15 to 25