title: Postal research: too many problems?
authors.forename: S M
authors.initials: SM
authors.lastname: Bates
authors.forename: K E
authors.initials: KE
authors.lastname: Rogstad
mesh_terms: D000293:Adolescent; D000328:Adult; D015982:Bias; D003219:Confidentiality; D003430:Cross-Sectional Studies; D006801:Humans; D010349:Patient Compliance; D011177:Postal Service; D015203:Reproducibility of Results; D012107:Research Design; D012201:Reward; D012680:Sensitivity and Specificity; D013048:Specimen Handling / Q000379:methods*