Role of vitamin D supplementation in modifying outcomes after surgery: a systematic review of randomised controlled trials oleh Akshay Patel, Babu Naidu, Roxanna Zakeri, David Thickett, James Hodson, Martin Hewison, Ruth Benson, Eric Lim, Paul Baker, Dimitri J Pournaras, Luke Rogers, Savannah Gysling, Edward J Caruana, Rory Morrison, Bo Khor, Jason Trevis, Tobin Mangel, Jennifer Manders, Ricky Vaja