Are our barbiturates really necessary?

Are their spectacles really necessary?

an experienced ophthalmic optician, I am also the Scottish representative of the British College of Ophthalmic Opticians and chairman of the National Optical Consultative Committee. The main defect in your editorial lies in the assumption that '80-90% of the prescriptions' for the 516 wearers of supposedly unnecessary spectacles out of 13 800 school children aged 10 years or less 'have been iss...

Are Histologic Studies of Adenotonsillectomy Really Necessary?

Introduction In most ear, nose, and throat services, it is routine to send the material extracted from tonsillectomy for histologic study to research malignancy, to analyze suspect material, or to provide medical-legal documentation. Recent studies have shown that this routine analysis is dispensable. Objective To evaluate the actual need and perform a cost-benefit analysis of routine histopath...

Anaerobic membrane bioreactors: Are membranes really necessary?

Membranes themselves represent a significant cost for the full scale application of anaerobic membrane bioreactors (AnMBR). The possibility of operating an AnMBR with a self-forming dynamic membrane generated by the substances present in the reactor liquor would translate into an important saving. A selfforming dynamic membrane only requires a support material over which a cake layer is formed,...

Risk prediction models: are they really necessary?

Mailing address: Domingo M. Braile • Av. Juscelino K. Oliveira, 1505 Jardim Tarraf I 15091-450 São José do Rio Preto, SP Brasil E-mail: [email protected] Manuscript received November 15, 2010, revised manuscript received November 15, 2010, accepted November 18, 2010.

Are the U.S. Patent Priority Rules Really Necessary?