function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chen, Zhi-Teng', 1],
    ['Liu, Hao & Yan, Yanhua & Li, Weihai', 2],
    ['Liu, Hao & Yan, Yanhua & Li, Weihai & Shi, Mingwang', 1],
    ['Liu, Ruijun & Li, Wenliang & Li, Weihai & Shali, Yasen', 2],
    ['Mo, Raorao & Cao, Jinjun & Wang, Guoquan & Li, Weihai', 2],
    ['Mo, Raorao & Wang, Guoquan & Li, Weihai', 1],
    ['Stark, Bill P. & Sivec, Ignac', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);