Preprocedural ultrasound versus landmark techniques for spinal anesthesia performed by novice residents in elderly: a randomized controlled trial von Rizk, Marwan S, Zeeni, Carine A, Bouez, Joanna N, Bteich, Nathalie J, Sayyid, Samia K, Alfahel, Waseem S, Siddik-Sayyid, Sahar M

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