Thank you, Marshall. Our overall second quarter procedure growth was 18% compared to 16% during the second quarter of 2017 and 15% last quarter. Our Q2 procedure growth was driven by 17% growth in U.S. procedures and 22% growth in OUS markets. In the U.S., procedure performance across general surgery, gynecology and urology, all exceeded our expectations with Q2 year-over-year growth rates accelerating modestly across these largest categories. Q2 procedure performance was again driven by growth in general surgery. Hernia repair and colorectal procedures continued to lead the way as these categories, again, added the most incremental cases. As usage of da Vinci in the U.S. general surgery expands. Other general surgery procedures contributed larger numbers of incremental cases than previous quarters. In U.S. gynecology, second quarter 2018 growth was consistent with 2017 and Q1 2018 trends as procedures in this mature category grew modestly year-over-year with growth led by hysterectomy. We hypothesize our growth in gynecology to be driven by favorable surgical consolidation trends. As our da Vinci surgery data indicate, an increasing proportion of U.S. gynecology procedures are being performed by higher volume physicians that specialize in complex benign and cancer surgery. Q2 U.S. urology procedures also had growth rates consistent with 2017 and Q1 2018, driven by prostatectomy volumes. As a mature procedure category, we believe that our U.S. prostatectomy volumes have been tracking to the broader prostate market, which has benefited from recent macro trends. In U.S. other procedures, adoption of lobectomies and other thoracic procedures was again solid during the second quarter. Utilization of our da Vinci Xi systems and surgical staplers, which helped to optimize robotics thoracic procedures, has been increasing. Second quarter OUS procedure volume grew approximately 22% compared with 22% for the second quarter of 2017 and 18% last quarter. Second quarter 2018 OUS procedure growth was driven by continued growth in dVP procedures and earlier stage growth in kidney cancer procedures, general surgery and gynecology. As expected, Q2 OUS procedure growth was higher than Q1, benefiting from more operating days, resulting from the timing of holidays, including Easter. Procedure growth in Japan accelerated as initial cases were performed within the set of 12 additional procedures approved for reimbursement effective April 1st. Procedure growth in China again moderated in Q2, as da Vinci system capacity expansion is constrained by system quota requirements, the most recent of which expired at the end of 2015. In Europe, procedure results vary by country with particular strength in the UK. Over the years, the discussions surrounding da Vinci surgery has been centered around the clinical patient benefits. In addition, we believe there is substantial opportunity to create surgeon value as well by improving the ergonomic characteristics of surgery. In 2017, in the annals of surgery, Dr. Chantal, CJ Alleblas, et al, published an analysis entitled, prevalence of musculoskeletal disorders, MSTs, among surgeons perform minimally invasive surgery, a systemic review. This metastudy reviewed 35 articles, including over 7,000 surgeons. The authors characterize the risk factors associated with lab surgery to include, static body posture, repetitive upper extremity movements and forced exertion from adverse positions. Moreover, the workload has increased by the high level of task precision and time pressure. Physical demands defer between open and laparoscopic surgery and comparative studies have reported higher prevalences of physical complaints for laparoscopic surgeons. Recent studies report MSD prevalence rates of 73% to 88% among specialists in MIS. Relative to the general population, these numbers are excessively high. In their study, the authors found, a 74% prevalence of physical complaints among laparoscopic surgeons. However, the low response rates and the high inconsistency across studies leave some uncertainty, suggesting an actual prevalence of between 22% and 74%. Fatigue and MSDs impact cycle motor performance. Therefore, these results warrant further investigation. While pain ratings are subjective, we think there is opportunity to improve ergonomics for surgeons. With our recent bariatric surgery indication and SureForm 60 millimeter stapler 510 (k) clearance, we are better positioned to serve bariatric surgeons. I will now turn to our financial outlook for 2018, starting with procedures. On our last call, we forecast full year 2018 procedure growth within a range of 12% to 15%. We are now increasing our forecast and estimate full year 2018 procedure growth of 14.5% to 16.5%. Turning to gross profit. We continue to expect our pro forma gross profit margin to be within a range of between 70% and 71.5% of net revenue. Our actual gross profit margin will vary quarter-to-quarter depending largely on product, regional and trade and mix, and the impact of new product introductions. Turning to operating expenses. We continue to expect to grow pro forma 2018 operating expenses between 16% and 18% above 2017 levels as we follow through on investments in several strategic areas intended to benefit the Company over the long term. We continue to expect our non-cash stock compensation expense to range between $245 million and $255 million in 2018 as forecast on our last call. We expect other income, which is comprised of mostly interest income to total between $70 million and $75 million 2018, up from $55 million to $60 million forecast on our last call. With regards to income tax, on our last call, we forecast our 2018 pro forma income tax rate to be between 20% and 21% of pretax income. We are now shifting our estimates slightly lower to a range of between 19.5% and 25.5% of pretax income. That concludes our prepared remarks. We will now open the call to your questions.