function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chen, Qian & Dai, Yu-Cheng', 2],
    ['Chen, Qian & Liu, Lu & Zhang, De-Shun & Dong, Li-Li', 2],
    ['Chen, Qian & Luo, Hua-Dong & Cheng, Na & Zhang, De-Shun', 3],
    ['Hussain, Shah & Al-Kharousi, Moza & Al-Muharabi, Marwa A.', 1],
    ['Karunarathna, Samantha C. & Priyashantha, K Hasith', 1],
    ['Regio, Nicolas do Carmo & Palacio, Melissa', 1],
    ['Zambrano-Forero, Cristian J & Davila-Giraldo, Lina R', 1],
    ['Zhang, Xiaojie & Yuan, Qi & Su, Jiangqing & Zhao, Changlin', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    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);