function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Durán-Ramírez, Carlos Alberto & Mayén-Estrada, Rosaura', 1],
    ['Pan, Hongbo & Li, Lifang & Al-Rasheid, Khaled A. S.', 3],
    ['Qu, Zhishuai & Li, Lifang & Lin, Xiaofeng & Stoeck, Thorsten', 2],
    ['Qu, Zhishuai & Pan, Hongbo & Lin, Xiaofeng & Li, Lifang', 3],
    ['Wang, Congcong & Qu, Zhishuai & Hu, Xiaozhong', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=11)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 5, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);