P&datasource[]=ajnr&datasource[]=ams&datasource[]=aps_physical&datasource[]=appi_book&datasource[]=appi_journal&datasource[]=apha&datasource[]=asip&datasource[]=asm&datasource[]=asn&datasource[]=aspb&datasource[]=avs&datasource[]=annual_reviews&datasource[]=arxiv&datasource[]=acm&datasource[]=berghahn&datasource[]=cabi&datasource[]=clinical_trials&datasource[]=dailymed&datasource[]=degruyter&datasource[]=du_press&datasource[]=esa&datasource[]=eu_press&datasource[]=elsevier&datasource[]=emerald&datasource[]=ejtr&datasource[]=emea&datasource[]=epo&datasource[]=faseb&datasource[]=gsa&datasource[]=health_affairs&datasource[]=hindawi&datasource[]=imanager&datasource[]=imedpub&datasource[]=informa_healthcare&datasource[]=informs&datasource[]=ieee&datasource[]=iop&datasource[]=iasted&datasource[]=iucr&datasource[]=iospress&datasource[]=jbjs&datasource[]=leftcoast&datasource[]=lu_press&datasource[]=mesharpe&datasource[]=mary_ann_liebert&datasource[]=medline&datasource[]=mit_press&datasource[]=nature&datasource[]=oxford&datasource[]=psu_press&datasource[]=pier_professional&datasource[]=pnas&datasource[]=portlandpress&datasource[]=psyc_articles&datasource[]=psyc_books&datasource[]=psyc_critiques&datasource[]=plos_journal&datasource[]=pubmed_central&datasource[]=purdue_press&datasource[]=rsna&datasource[]=rockefeller&datasource[]=rcn&datasource[]=ria&datasource[]=rsc&datasource[]=sage&datasource[]=spie&datasource[]=springer_journal&datasource[]=springer&datasource[]=taylor_francis&datasource[]=aps&datasource[]=the_scientist&datasource[]=uc_press&datasource[]=uchi_press&datasource[]=hawaii_press&datasource[]=uni_neb&datasource[]=uni_wisc&datasource[]=uspto_abstract&datasource[]=wiley&datasource[]=pct references for this article view all chow, w. H; johansen, c; gridley, g, "gallstones, cholecystectomy and the risk of cancers of the liver, biliary tract and pancreas" ekbom, a; yuen, j; karlsson, b. M, "risk of pancreatic and periampullar cancer following cholecystectomy. A population-based study" khan, z. R; neugut, a. I; ahsan, h; chabot, j. A, "risk factors for biliary tract cancers" ekbom, a; hsieh, c. C; yuen, j, "risk of extrahepatic bileduct cancer after cholecystectomy" rothman, k. J; greenland, s, "modern epidemiology" not what you're looking for? Try searching for it on deepdyve! Search browse: subject areas | journals | publishers welcome to deepdyve simple. Affordable. generic viagra online cheap viagra cheapest canadian pharmacy for viagra http://floridalighttacklecharters.com/thq-generic-viagra-shipped-overnight-zs/ buy viagra online generic viagra online viagra online cheap http://nationalityinworldhistory.net/bsh-buy-generic-viagra-online-jc/ viagra without a doctor prescription overnight delivery medicaresupplementspecialists.com/pfz-100-mg-generic-viagra-np/ Research. Deepdyve — the simplest way to get the articles you need. Follow @deepdyve about company how it works partners publisher.
National Pass - Blue Mountains - Australia

One of Australia's finest bushwalking trails.
buy viagra spray menSix kilometres of majestic wild scenery and waterfalls in the
Greater Blue Mountains
World Heritage Area.




Building the National Pass

The National Pass hiking track was built with picks, shovels, crowbars and dynamite between 1906 and 1907. It involved cutting a zig-zag staircase into a cliff face and became a very popular walking trail.   Learn more

Restoring the Trail

After 95 years service, the track had to be closed in 2002. Bushfires, rain storms and landslides played havoc with fencing and wooden bridges. The $1.5 million restoration project won a National Trust award.   Learn more

Bushwalking Tips

Walking this historic trail will be more enjoyable if you prepare well. Bring a camera and binoculars if you can. Make sure you have adequate clothing should the weather change. Carry water and snacks. Don't stray off the trail.