2017:  The Japan Pediatric Association and the Japan Medical Association on Feb. 15 unveiled a poster warning against the dangers of the excessive use of smartphones.The poster poses the question, “What do I sacrifice with time spent on my smartphone?” and responds with the six categories of sleep, academic performance, brain function, physical strength, vision, and communication ability. The poster will be sent to approximately 170,000 members of the two associations to be put up at clinics nationwide. 

The Japan Pediatric Association had already issued recommendations in 2004 “that time spent watching television, playing mobile phone games, or otherwise using cell phones be limited to a maximum of two hours per day, and that children up to 2 years of age refrain from watching television or videos. The association is calling for smartphone use to be limited accordingly.” 

MORE INFO HERE  Carcinogenesis from chronic exposure to radio-frequency radiation

Source: “Medical associations warn against children’s excessive use of smartphones” The Mainichi , 2.16.2017

Japan does not have protective RF limits.