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Smith CJ , Fox ZV . The use and abuse of hypothesis tests: how to present P values. Phlebology 2010;25:107–12

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Kanchanabat B , Stapanavatr W , Meknavin S , Soorapanth C , Sumanasrethakul C , Kanchanasuttirak P . Systematic review and meta-analysis on the rate of postoperative venous thromboembolism in orthopaedic surgery in Asian patients without thromboprophylaxis. Br J Surg 14 June 2011; doi: 10.1002/bjs.7589

Murad MH , Coto-Yglesias F , Zumaeta-Garcia M , A systematic review and meta-analysis of the treatments of varicose veins. J Vasc Surg 2011;53(Suppl):49S–65S