1. What is meant by primary end point and secondary end point? 2. Can chronic exposure to…

1. What is meant by primary end point and secondary end point? 2. Can chronic exposure to organophosphorus compounds (in farmers) cause axonal radiculoneuropathy persisting for years? Is this disease reversible? 3. In view of the controversial reports on the use of melatonin for long distance flights, I would like to know if the editors use it?

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