Do I need informed consent if I use human participants in my research?

Papers reporting human studies must include a statement that specifies whether informed consent was obtained from study participants. The informed consent statement should specify whether informed consent was obtained, and whether it was written or verbal (and if the latter why that was the case, in addition to how the consent was recorded), or if the need for consent was waived by ethics committee/IRB or another authorized body (including the reason for the waiver). If informed consent was not sought, please specify why it was not required and cite the relevant guidelines or legislation where applicable, for the benefit of an international readership.