Tramadol: a valuable treatment for pain in Southeast Asian countries Bằng Vijayan R, Afshan G, Bashir K, Cardosa M, Chadha M, Chaudakshetrin P, Hla KM, Joshi M, Javier FO, Kayani AG, Musba AT, Nimmaanrat S, Pantjawibowo D, Que JC, Vijayanand P

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