Jackson, J
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I can show a lot and still not be showing anything at all, in a way
These previous studies [12,13,14,15,16,17] had several limitations such as the inclusion of relatively small number of cases, especially for rare type of congenital anomalies (i.e., being underpowered to detect small or moderate risk effect), the use of case-control design (i.e., being more prone to selection bias), or insufficient adjustment for potential confounders (i.e., being more prone to confounding bias)
If a draught can't be avoided, try shielding the flame from the draught, for instance by placing it in a candle holder, and turn the candle periodically to avoid uneven burning and possible candle collapse