Fraud in a population-based study of headache: prevention, detection and correction

por Ahmed, Bilal, Ahmad, Ali, Herekar, Akbar A, Uqaili, Umer L, Effendi, Jahanzeb, Alvi, S Zia, Herekar, Arif D, Steiner, Timothy J
Publicado 2014

The burden of headache disorders in Pakistan: methodology of a population-based nationwide study, and questionnaire validation

por Herekar, Arif D, Herekar, Akbar A, Ahmad, Ali, Uqaili, Umer L, Ahmed, Bilal, Effendi, Jahanzeb, Alvi, Syed Z, Steiner, Timothy J
Publicado 2013