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Effects of experimentally sustained elevated testosterone on incubation behaviour and reproductive success in female great tits (Parus major).Clutch-size variation in Western Palaearctic secondary hole-nesting passerine birds in relation to nest box designBrominated flame retardants and organochlorines in the European environment using great tit eggs as a biomonitoring toolThe design of artificial nestboxes for the study of secondary hole-nesting birds: A review of methodological inconsistencies and potential biases