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Different combined oral contraceptives and the risk of venous thrombosis: systematic review and network meta-analysis

BMJ 2013; 347 doi: https://doi.org/10.1136/bmj.f5298 (Published 12 September 2013) Cite this as: BMJ 2013;347:f5298

Re: Different combined oral contraceptives and the risk of venous thrombosis: systematic review and network meta-analysis

In the search stretegy the authors should include only those studies which had excluded Obesity (BMI>30 kg/m)and sedentary life style and other causes of deep vein thrombosis like surgery, bed-ridden, co-agulation factors, etc. to conclude the exclusive effect of Oral contraceptives in causation of venous thrombosis.

Competing interests: No competing interests

14 September 2013
Neeru Gupta
Scientist E
Neeta Kumar, KK Jani
Indian Council of Medical Research
Ansari Nagar, New Delhi-110029