A method and apparatus permit handling of unwanted calls from callers such as telemarketers, when caller identification is provided. An example apparatus includes a base having a saddle supporting a matrix to which the control arm is removably affixed. For each stage a stall signal, delayed with respect to the stall signal of a downstream stage, is generated and used to select whether the pipeline stage in question is triggered. The telescoping frame comprises a plurality of rollers configured to be capable of rotating when engaged with the plurality of flexible members and the flexible cover. The replication copy may be provided by a third party application, or created by the client or a storage management system component. The present invention also relates to the development of an easy method for identification of nitrite in clinical samples as well as its correlation with the severity of the disease.