Epidural analgesia and backache after childbirth

The task is to carry out a systematic review (and meta-analysis, if possible)
Report will be developed according to PRISMA guidelines, available here: http://www.prisma-statement.org/PRISMAStatement/ 
 
Topic: Epidural analgesia and backache after childbirth; A systematic review.
 
A search in EMBASE (OVID) AND MEDLINE(OVID) has already been performed with the following criteria:
MEDLINE OVID
 
Epidural an?esthesia.tw
Exp epidural anesthesia/
Epidural analgesia.tw
Exp Epidural analgesia/
Exp Obstetrical anesthesia/
Obstetrical an?esthesia.tw
Exp Obstetrical analgesia/
Obstetrical analgesia.tw
Regional an?esthesia.tw
Neuraxial an?esthesia.tw
Neuraxial blockade.tw
Regional epidural.tw
Exp bupivacaine/
Bupivacaine.tw
Exp lidocaine/
Lidocaine.tw
Marcaine.tw
Lignocaine.tw
Chloroprocaine.tw
Intrathecal.tw.
 
1.    Exp pregnancy/
2.    Pregnan*.tw
3.    Labo?r.tw
4.    Postpartum.tw
5.    birth.tw
6.    Exp obstetric delivery/
7.    Obstetric delivery.tw
8.    Intrapartum.tw
9.    Childbirth.tw
10.  Parturition.tw
11.  Obstetric*.tw
12.  Delivery.tw
13.  Parturient.tw
 
Exp back pain/
Backpain.tw
backache.tw
low backpain.tw
lower backpain.tw
low backache.tw
lower backache.tw
lumbar pain.tw
Lumbago.tw
Adverse effect.tw
Adverse event.tw
Adverse result.tw
Side effect.tw
 
 
EMBASE OVID
 
Epidural an?esthesia.tw
Exp Epidural anesthesia/
Epidural analgesia.tw
Exp Epidural analgesia/
Exp Obstetric anesthesia/
Obstetric* an?esthesia.tw
Exp Obstetric analgesia/
Obstetric* analgesia.tw
Exp Regional anesthesia/
Regional an?esthesia.tw
Neuraxial an?esthesia.tw
Neuraxial blockade.tw
Regional epidural.tw
Exp local anesthetic agent/
Exp local anesthesia/
Bupivacaine.tw
Lidocaine.tw
Marcaine.tw
Lignocaine.tw
Chloroprocaine.tw
Intrathecal.tw
a.                    
Exp pregnancy/
Pregnan*.tw
Exp labor/
Exp childbirth/
Labo?r.tw
Postpartum.tw
birth.tw
Exp obstetric delivery/
Obstetric delivery.tw
Intrapartum.tw
Childbirth.tw
Parturition.tw
Exp birth/
Obstetric*.tw
Delivery.tw
Parturient.tw
 .                     
Exp backache/
Postpartum pain/
Postpartum pain.tw
Back?pain.tw
backache.tw
low* back?pain.tw
low* backache.tw
lumbar pain.tw
Lumbago.tw
Exp adverse event/
Adverse event.tw
Adverse effect.tw
Adverse result.tw
Side effect.tw
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