function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Akrami, Mohammad Ali', 2],
    ['Aoki, Jun-Ichi', 1],
    ['Chatterjee, Tapas & Pfingstl, Tobias & Pešić, Vladimir', 1],
    ['Ebrahimi, Forough & A, Mohammad', 1],
    ['Ermilov, Sergey G. & Anichkin, Alexander E.', 1],
    ['Iglesias, Ricardo & Palacios-Vargas, José G.', 1],
    ['Mortazavi, S. & Tajmiri, P. & Hajizadeh, J. & I, Northern', 1],
    ['Norton, Roy A. & Ermilov, Sergey G.', 12],
    ['Revelo-Tobar, Harol', 3],
    ['Schatz, H. & Schuster, R.', 3],
    ['Weigmann, G. & Miko, L.', 2],
    ['van der Hammen, L.', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=33)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);