Dr Sophia Ng Mo-tack doesn't have to go far from her chiropractic office in Central to see potential patients. She sees them everywhere she goes. On the MTR, in coffee shops, sitting on benches in Hong Kong Park and wandering around shopping malls.
There's nothing unusual about their appearance. They are average-looking teenagers - sometimes in school uniform, sometimes in casual clothes. But what gives them away is their posture: heads down, shoulders hunched in a curve as their thumbs and fingers tap away at the smart phones in their hands or on the keys of the laptops balanced precariously on their knees.
It's a common sight in Hong Kong and one which illustrates how the traditional forms of study, leisure and communication have been ousted by technology.
But according to Ng, this bad posture - coupled with overuse of computers, handheld game devices and smartphones - is putting children and teenagers at risk of aches and pains later in life.
'They may not feel any pain now because they are young and have a lot of joint space, and their muscles are very flexible. But carry on like this and they are risking a lot of problems when they are older,' she says.
Ng, who chairs the public relations committee of the Hong Kong Chiropractors' Association (HKCA), says more people in their 20s and 30s are suffering back and neck problems more often associated with much older people.
The view among her colleagues is that in many cases bad posture shown while using computers, handheld games and smartphones for long periods is to blame. They have even begun using the term 'iPhone syndrome' to describe a range of symptoms they are seeing increasingly in the young.