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. 2019 Jul 24;7(8):E974–E978. doi: 10.1055/a-0838-5424

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Fig. 2 — Orientation of the orifice at the end of the catheter is aided by one solid black line and two interrupted black lines. a Interrupted black lines indicate that the orifice in 90 degrees away. (Source: INTERSCOPE INC) b Solid black line indicates that the orifice is 180 degrees away.