function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aguin-Pombo, Dora & Freitas, Carlos', 2],
    ['Ball, E. D.', 1],
    ['Duan, Yani & Zhang, Yalin', 3],
    ['Khatri, Imran & Webb, Michael D.', 3],
    ['Kushwaha, Sandeep & Khare, Preety & Jahan, Sonam', 3],
    ['Mozaffarian, Fariba & Wilson, Michael R.', 2],
    ['Tezcan, S. & Gulpercin, N. & Zeybekoglu, U. & Karavin, M.', 1],
    ['Zahniser, James N.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);