The World Health Organization’s classification of wireless phone-associated radiofrequency electromagnetic fields as a possible carcinogen has raised questions over the safety of cell phones.

A U.S. civic organization assessed cell phones based on their specific absorption rates or SAR. The rate measures the level at which energy is absorbed by the body that has been exposed to a radiofrequency electromagnetic field.

South Korean products dominated the list of top ten cell phones that absorb the least amount of radiofrequency electromagnetic fields.

LG Electronics’ Quantum took first place with a SAR of 0-point-35 watts per kilogram. Pantech’s Breeze came in second followed by Samsung Electronics phone models that ranked fifth, sixth, seventh, eighth and ninth.

However, experts say that the SAR is a rough measurement and the amount of radiofrequency electromagnetic fields the body absorbs differs depending a person’s physical condition and how and where a cell phone is used.

As a preventive measure against harms caused by cell phone-related carcinogens, the U.S. Federal Communications Commission bans the sale of mobile phones whose SAR exceeds one-point-six. South Korea has adopted the same standard against wireless phone-associated electromagnetic fields.