In the digital age, the internet has become an essential source of information gathering and maintains a network of …'s internet use on teenager's cognitive skills. Using mobile internet users and base station density as instruments, we found that … guardian's internet use had a significant impact on teenager's cognitive abilities as measured by math and verbal tests …

a consequence have used it as a pretext to increase control on the internet, jeopardising in such a way free speech …

Objective: Pertussis is a highly contagious infection affecting mainly children. Acellular pertussis vaccines were … recently introduced in Canada based on evidence of improved safety and efficacy over whole cell vaccines, the current standard …

attenuated vaccines will be increasingly used in children. Inactivated vaccines will continue to be used mainly for the elderly …

children under 5 years of age. Vaccines which can prevent this infection are available. Objective: To evaluate the costs and …