Abstract Background Maximizing response rates is critically important in order to provide the most generalizable and unbiased research results.High response rates reduce the chance of respondents being systematically different from non-respondents, and thus, reduce the risk of results not truly reflecting the study population.Monetary incentives ar
This study considers a system of multi-server queues with two classes of impatient customers: high-priority and low-priority.Customers join the system according to a Poisson process and customers may abandon service after entering the queue for an exponentially distributed duration with distinct rates.In this paper, we consider last come-first serv
Direction of arrival (DOA) estimation is an important topic in array signal processing.Currently, most research activities are focused on the single signal transmission (SST) type of signals, i.e.only one physical signal is used to carry the Heating Pads information from a transmitter to a receiver with a given polarisation setting.However, to make
Introduction.We present the extremely rare case of a patient with three metachronous osteosarcomas within 22 years without evident pulmonary manifestation of disease 30 years after first diagnosis.Case Presentation.In 1983, a high-grade osteosarcoma of the left distal femur was diagnosed in an 18-year-old Caucasian male.He received rotationplasty a