and imputed the next available measurement if the zero value appeared to be due to equipment failure. We estimated that a sample size of 4000 would include 200 cases with the primary outcome, based on ...

You are invited to submit your quotation offering your best prices and delivery conditions to UNESCO for the provision of services described below: Conduct a baseline study at Tsodilo Hills World ...

You are invited to submit your quotation offering your best prices and delivery conditions to UNESCO for the provision of services described below: ...