Backrests of a rear seat system are attached to a cross member which extends between the wheel housings of the rear structure of a motor vehicle. in a preferred embodiment, a method for treating skin and nail infections comprises irradiating the treatment site with a light radiation source operating at one or more near infrared wavelengths which are absorbed by the pathogenic microbes, specifically operating at 980\xb130 nm, 1470\xb140 nm andor 1900\xb160 nm. The server receives, from a first client machine, a communication identifying a first web application and a first application identifier, the instance of the first web application being associated with one or more components. The hub design enables identical hub bodies to be used for a spreader hub and a rib hub.