Effect of hand hygiene intervention on the absenteeism of pre-school children in Klang Valley, Malaysia: a quasi-experimental study Bằng Mohamed @ Abd Aziz, Nurul Azmawati, Mohd Rani, Mohd Dzulkhairi, Tengku Jamaluddin, Tengku Zetty Maztura, Ismail, Zarini, Ramli, Shalinawati, Faroque, Habibah, Abd Samad, Farisha Nur, Ariffien, Abdul Rashid, Che Amir Farid, Aisyah Ar Redha, Isahak, Ilina

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